Plug g.f. for A000108 (minus the leading 1), 1/2*(1-(1-4*x)^(1/2))/x - 1, into cycle index for dihedral group D_3.

A056711

Plug g.f. for A000108 (minus the leading 1), 1/2*(1-(1-4*x)^(1/2))/x - 1, into cycle index for dihedral group D_3.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =8a(6) =28a(7) =100a(8) =358a(9) =1309a(10) =4772a(11) =17556a(12) =64782a(13) =240090a(14) =892662a(15) =3329942a(16) =12456782a(17) =46725350a(18) =175698056a(19) =662193908a(20) =2501118956a(21) =9465771967a(22) =35891640172a(23) =136331485336a(24) =518702002350

External references