A107029 Diagonal sums of number triangle A107027.

1, 1, 3, 3, 5, 7, 11, 19, 35, 69, 151, 339, 829, 2111, 5607, 15737, 45289, 136477, 423279, 1353671, 4471673, 15114479, 52605755, 187162155, 681817179, 2539492249, 9646349779, 37415172217, 147745308403, 594368656811

Offset

0,3

Links

Table of n, a(n) for n=0..29.

Formula

a(n)=sum{k=0..floor(n/2), (n-2k-1)C((n-2k)*k, k)-(n-2k-2)*sum{j=0..k, C((n-2k)*k, j)}}

Crossrefs

Sequence in context: A328222 A306276 A001588 * A352912 A240180 A169942

Adjacent sequences: A107026 A107027 A107028 * A107030 A107031 A107032

Keyword

easy,nonn

Author

Paul Barry, May 09 2005

Status

approved