A119364 Central coefficients of number triangle A119335.

0, 1, 1, 1, 11, 81, 351, 1149, 3529, 12601, 52724, 222641, 879308, 3295384, 12303201, 47320365, 186738507, 739129809, 2894481813, 11237844615, 43647142533, 170543919327, 669744238998, 2633027605209, 10337488816041, 40544676533466

Offset

0,5

Comments

A119363(n)-a(n)=A119365(n).

Links

Table of n, a(n) for n=0..25.

Formula

a(n)=sum{k=0..n-1, C(n+1,3k)*C(n-1,3k)}; a(n)=A119335(2n,n+1).

Crossrefs

Sequence in context: A024146 A233176 A156847 * A305826 A252817 A210064

Adjacent sequences: A119361 A119362 A119363 * A119365 A119366 A119367

Keyword

easy,nonn

Author

Paul Barry, May 16 2006

Status

approved