OFFSET
0,4
MATHEMATICA
a[0] = 1; a[n_] := a[n] = Sum[Mod[Binomial[n, k], 2] a[k - 1] a[n - k], {k, 1, n}]; Table[a[n], {n, 0, 33}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 19 2020
STATUS
approved