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A110130 Central coefficients of a scaled Legendre triangle. 0
1, 0, 2, 4, 22, 136, 504, 5136, 16966, 240368, 752800, 13660480, 41492284, 918172848, 2734083968, 71399743744, 209681631814, 6312095369056, 18348172005888, 625558677709824, 1804161160185748, 68713071248064560 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 7 17:02 EDT 2020. Contains 336277 sequences. (Running on oeis4.)