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Search: id:A113108
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| A113108 |
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Triangle T, read by rows, equal to the matrix square of triangle A113106, which satisfies the recurrence: A113106(n,k) = [A113106^5](n-1,k-1) + [A113106^5](n-1,k). |
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+0
5
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| 1, 2, 1, 16, 12, 1, 440, 416, 62, 1, 43600, 48320, 10016, 312, 1, 16698560, 20765520, 5394320, 246016, 1562, 1, 26098464448, 35382716032, 10854556720, 646408320, 6116016, 7812, 1, 172513149018752, 250136469031744, 87213434633152
(list; table; graph; listen)
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OFFSET
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0,2
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EXAMPLE
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Triangle begins:
1;
2,1;
16,12,1;
440,416,62,1;
43600,48320,10016,312,1;
16698560,20765520,5394320,246016,1562,1;
26098464448,35382716032,10854556720,646408320,6116016,7812,1; ...
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PROGRAM
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(PARI) {T(n, k)=local(M=matrix(n+1, n+1)); for(r=1, n+1, for(c=1, r, M[r, c]=if(r==c, 1, if(c>1, (M^5)[r-1, c-1])+(M^5)[r-1, c]))); return((M^2)[n+1, k+1])}
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CROSSREFS
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Cf. A113106.
Adjacent sequences: A113105 A113106 A113107 this_sequence A113109 A113110 A113111
Sequence in context: A078074 A016447 A095850 this_sequence A013125 A012967 A013121
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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), Oct 14 2005
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