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A107029 Diagonal sums of number triangle A107027. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A323529 A306276 A001588 * A240180 A169942 A215777

Adjacent sequences:  A107026 A107027 A107028 * A107030 A107031 A107032

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 09 2005

STATUS

approved

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Last modified November 20 14:54 EST 2019. Contains 329337 sequences. (Running on oeis4.)