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

Author

Paul Barry, Jul 13 2005

Keywords

• easy
• nonn

Comments

Central coefficients of triangle A110124.

Programs

PARI

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

Formula

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