OFFSET
0,2
COMMENTS
Central column of the nonzero coefficients of the Swiss-Knife polynomials, a(n) = A153641(4*n, 2*n).
FORMULA
a(n) = (-1)^n * A086646(2n,n). - Alois P. Heinz, Apr 27 2023
PROG
(Sage)
def A214445(n) : return binomial(4*n, 2*n)*euler_number(2*n)
CROSSREFS
KEYWORD
sign
AUTHOR
Peter Luschny, Jul 18 2012
STATUS
approved