100398domain: NAppears in sequencesa(n) = Sum_{k=1..n} floor(k^4/n).at n=25A014819a(0) = 0, a(1) = 1, for n > 1, a(n) = a(n-1) + a(n-A002487(n)).at n=33A283474First differences of A283474.at n=44A283479