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

1,2

Links

Table of n, a(n) for n=1..6.

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.

Crossrefs

Cf. A348115, A036038, A347842.

Sequence in context: A188418 A136653 A165434 * A341473 A086217 A203197

Adjacent sequences: A348115 A348116 A348117 * A348119 A348120 A348121

Keyword

more,nonn

Author

Álvar Ibeas, Oct 01 2021

Status

approved