159980domain: NAppears in sequences"BFK" (reversible, size, unlabeled) transform of 1,3,5,7...at n=16A032046a(n) = n^4 - n.at n=20A058895a(n) = 400*n^2 - 20.at n=19A158597A sum over partitions (q=20), see first comment.at n=4A221584