A348118 - OEIS

%I #8 Oct 03 2021 19:27:05

%S 1,4,39,876,60117,14466888

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

%F 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.

%Y Cf. A348115, A036038, A347842.

%K more,nonn

%O 1,2

%A _Álvar Ibeas_, Oct 01 2021