Cardinality of the Weyl alternation set corresponding to the zero-weight in the adjoint representation of the Lie algebra sp(2n).

A232165

Cardinality of the Weyl alternation set corresponding to the zero-weight in the adjoint representation of the Lie algebra sp(2n).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =3a(4) =8a(5) =18a(6) =37a(7) =82a(8) =181a(9) =392a(10) =856a(11) =1873a(12) =4086a(13) =8919a(14) =19480a(15) =42530a(16) =92853a(17) =202742a(18) =442665a(19) =966496a(20) =2110240a(21) =4607473a(22) =10059866a(23) =21964555a(24) =47957080a(25) =104708706a(26) =228619317a(27) =499163818a(28) =1089866333a(29) =2379596808

External references