62858025domain: NAppears in sequencesT(n,k) = V(n,k)/k!, where V(n,k) = k^(n*k) - Sum_{t=1..k-1} binomial(k,t)*k^(n*(k-t))*V(n,t) for n, k >= 1; square array T read by upwards antidiagonals.at n=30A342202a(n) = (27^n - 3*9^n - 3*12^n)/6 + 6^n.at n=5A342405