A110130 Central coefficients of a scaled Legendre triangle.

1, 0, 2, 4, 22, 136, 504, 5136, 16966, 240368, 752800, 13660480, 41492284, 918172848, 2734083968, 71399743744, 209681631814, 6312095369056, 18348172005888, 625558677709824, 1804161160185748, 68713071248064560

Offset

0,3

Comments

Central coefficients of triangle A110124.

Links

Table of n, a(n) for n=0..21.

Formula

a(n)=2^ceiling(n/2)*LegendreP(ceiling(n/2), floor(n/2));

Prog

(PARI) a(n)=2^ceil(n/2)*pollegendre(ceil(n/2), n\2) \\ Charles R Greathouse IV, Mar 19 2017

Crossrefs

Sequence in context: A279705 A321248 A309741 * A259116 A283322 A019025

Adjacent sequences: A110127 A110128 A110129 * A110131 A110132 A110133

Keyword

easy,nonn

Author

Paul Barry, Jul 13 2005

Status

approved