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Search: id:A102400
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| A102400 |
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Triangle, read by rows, where T(n,k) = Sum_{j=0..k} T(n-1,j)*(j+1)*[(k+1)*(k+2)/2 - j*(j+1)/2] for n>k>0, with T(0,0)=1 and T(n,n) = T(n,n-1) for n>0. |
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+0
2
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| 1, 1, 1, 1, 7, 7, 1, 31, 139, 139, 1, 127, 1567, 5711, 5711, 1, 511, 15379, 126579, 408354, 408354, 1, 2047, 143527, 2357431, 15333661, 45605881, 45605881, 1, 8191, 1312219, 40769819, 473433344, 2634441290, 7390305396, 7390305396, 1, 32767
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Main diagonal is A082162 (with offset). This sequence is derived from column 0 of A102098.
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EXAMPLE
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T(4,2) = 1567 = 1*6 + 31*10 + 139*9
= T(3,0)*R(0,2) + T(3,1)*R(1,2) + T(3,2)*R(2,2).
Rows begin:
[1],
[1,1],
[1,7,7],
[1,31,139,139],
[1,127,1567,5711,5711],
[1,511,15379,126579,408354,408354],
[1,2047,143527,2357431,15333661,45605881,45605881],...
where the transpose of the recurrence coefficients given by
[R^t](n,k) = (k+1)*((n+1)*(n+2)/2 - k*(k+1)/2) form triangle:
[1],
[3,4],
[6,10,9],
[10,18,21,16],
[15,28,36,36,25],...
which equals the matrix square of the triangle:
[1],
[1,2],
[1,2,3],
[1,2,3,4],
[1,2,3,4,5],...
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PROGRAM
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(PARI) {T(n, k)=if(n<k|k<0, 0, if(k==0, 1, if(n==k, T(n, n-1), sum(j=0, k, T(n-1, j)*(j+1)*((k+1)*(k+2)/2-j*(j+1)/2)))))}
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CROSSREFS
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Cf. A082162, A102098, A102317.
Sequence in context: A011452 A093781 A108390 this_sequence A113810 A002161 A083871
Adjacent sequences: A102397 A102398 A102399 this_sequence A102401 A102402 A102403
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KEYWORD
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nonn,tabl
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jan 06 2005
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