59270domain: NAppears in sequencesa(0)=0, a(1)=1, a(n) = ( (a(n-1)+a(n-2)) XOR n) + n.at n=21A182506Floor(1/{(5+n^4)^(1/4)}), where {}=fractional part.at n=41A184629a(n) = Sum_{i=0..n} digsum_6(i)^4, where digsum_6(i) = A053827(i).at n=43A231675Partial sums of A253088.at n=45A255048