# A052751 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 19 4 107 5 647 6 4167 7 27847 8 191747 9 1349743 10 9671316 11 70297105 12 517079157 13 3841701488 14 28787546360 15 217317367487 16 1651144126659 17 12616570941114 18 96891439504019 19 747452640586114 20 5789461514134881