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Search: id:A067298
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| A067298 |
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Generalized Catalan triangle, based on C(2,2; n) := A064340(n). |
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+0
6
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| 1, 1, 2, 4, 5, 9, 28, 32, 36, 64, 256, 284, 300, 328, 584, 2704, 2960, 3072, 3184, 3440, 6144, 31168, 33872, 34896, 35680, 36704, 39408, 70576, 380608, 411776, 422592, 429760, 436928, 447744, 478912
(list; table; graph; listen)
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OFFSET
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0,3
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COMMENT
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For corresponding Catalan triangle with C(1,1; n) := A000108(n) see A028364.
Identity for each row n>=1: a(n,m)+a(n,n-(m+1))= a(n,n) = A067297(n) for m=0..floor((n-1)/2.). E.g. a(2k+1,k)= A067297(2*k+1)/2.
The columns (without leading zeros) give for m=0..3: A064340, A067299, 3*A067300, 8*A067301. The main diagonal gives A067297. The row sums give A067302.
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FORMULA
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a(n, m)= sum(C(2, 2; j)C(2, 2; n-j), j=0..m) if n>=m>=0 else 0.
G.f. for column m (without leading zeros): (c(m, x)*c(2, 2; x)-c2(m-1, x))/x^m, with c(2, 2; x)= (1-3*x*c(4*x))/(1-2*x*c(4*x))^2 (g.f. for C(2, 2; n)), c(x) g.f. for Catalan numbers A000108, c(m, x) := sum(C(2, 2; n)*x^n, n=0..m) and c2(m, x) := sum(A067297(n)*x^n, n=0..m) for m=0, 1, 2, ...
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EXAMPLE
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{1}; {1,2}; {4,5,9}; {28,32,36,64}; ...
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CROSSREFS
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Adjacent sequences: A067295 A067296 A067297 this_sequence A067299 A067300 A067301
Sequence in context: A120939 A120770 A073151 this_sequence A077389 A122991 A125728
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KEYWORD
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nonn,easy,tabl
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 5 2002
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