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A127090 Central terms of triangle A127082; a(n) = A127082(2*n,n). 10
1, 2, 15, 192, 3635, 92730, 2998366, 117857600, 5465922021, 292505725990, 17755023166100, 1205937035790936, 90649549598544937, 7473077539914412930, 670529221966656416145, 65059053545271098896848 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
a(n) is divisible by (n+1): a(n)/(n+1) = A127091(n).
LINKS
MATHEMATICA
T[n_, k_]:= T[n, k]= If[k==n, 1, Coefficient[(1 + x*Sum[x^(r-k)*Sum[T[r, c], {c, k, r}], {r, k, n-1}] + x^(n+1))^(k+1), x, n-k]]; Table[T[2*n, n], {n, 0, 15}] (* G. C. Greubel, Jan 30 2020 *)
CROSSREFS
Sequence in context: A052819 A349292 A328121 * A198522 A187655 A046249
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jan 04 2007
STATUS
approved

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)