A208983 Central terms of the triangle in A208101.

1, 2, 3, 14, 20, 110, 154, 910, 1260, 7752, 10659, 67298, 92092, 592020, 807300, 5259150, 7152444, 47071640, 63882940, 423830264, 574221648, 3834669566, 5188082354, 34834267234, 47073334100, 317506779800, 428634152730, 2902365981900, 3914819231400

Offset

0,2

Comments

a(2*n+1) = A126596(n).

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..1000

Mathematica

T[_, 0] = 1; T[n_, 1] := n; T[n_, n_] := T[n - 1, n - 2]; T[n_, k_] /; 1 < k < n := T[n, k] = T[n - 1, k] + T[n - 1, k - 2];
a[n_] := T[2n, n];
Table[a[n], {n, 0, 30}] (* Jean-François Alcover, Feb 03 2018, from A208101 *)

Prog

(Haskell)
a208983 n = a208101 (2 * n) n

Crossrefs

Sequence in context: A374232 A294405 A160218 * A337609 A081615 A157903

Adjacent sequences: A208980 A208981 A208982 * A208984 A208985 A208986

Keyword

nonn

Author

Reinhard Zumkeller, Mar 04 2012

Status

approved