A036720 G.f. satisfies A(x) = 1 + x*cycle_index(Klein_4_group, A(x)).

1, 1, 1, 4, 8, 27, 79, 270, 894, 3130, 11011, 39622, 143879, 528919, 1960248, 7323999, 27542451, 104194485, 396204388, 1513599583, 5806283770, 22356914550, 86376741339, 334752355281, 1300999638753, 5069411676111, 19800500391264

Offset

0,4

Links

Table of n, a(n) for n=0..26.

Crossrefs

Cf. A036717-A036719.

Sequence in context: A065405 A279627 A026085 * A110132 A099513 A104042

Adjacent sequences: A036717 A036718 A036719 * A036721 A036722 A036723

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved