# A007631 (b-file synthesized from sequence entry) 0 1 1 1 2 0 3 0 4 2 5 4 6 0 7 2 8 10 9 32 10 38 11 140 12 496 13 1186 14 3178 15 16792 16 82038 17 289566 18 1139874 19 5914118 20 33800010 21 142337180 22 721286448 23 4384569864