10,1
Alois P. Heinz, Table of n, a(n) for n = 10..470
b:= proc(u, o, t) option remember; series(`if`(u+o=0, x^t,
add(b(u+j-1, o-j, irem(t+1, 2)), j=1..o)+
add(b(u-j, o+j-1, 0)*x^t, j=1..u)), x, 6)
end:
a:= n-> coeff(b(n, 0$2), x, 5):
seq(a(n), n=10..30);
Column k=5 of A097592.
Sequence in context: A231918 A029823 A302902 * A253032 A251486 A268469
Adjacent sequences: A317282 A317283 A317284 * A317286 A317287 A317288
nonn
Alois P. Heinz, Jul 25 2018
approved
