90600domain: NAppears in sequencesa(n) = n*(n+1)*(n^2 + n + 4)/4.at n=24A061316Row sums of A136375.at n=29A151711Triangle read by rows: T(n,k) = number of arrangements of k non-attacking rooks on an n X n right triangular board with every square controlled by at least one rook.at n=61A290724