A348118 a(n) is the number of (strict) chains of subspaces with ends 0 and (F_4)^n, counted up to coordinate permutation.

1, 4, 39, 876, 60117, 14466888

Offset: 1

Author

Álvar Ibeas, Oct 01 2021

Keywords

• more
• nonn

Crossrefs

Cf. A348115, A036038, A347842.

Formula

a(n) = Sum_{L partition of n} A348115(n, L) * A036038(len(L), sig(L)), where sig(L) is the partition composed by the part multiplicities of L.