# A037739 (b-file synthesized from sequence entry) 1 2 2 13 3 81 4 486 5 2918 6 17509 7 105057 8 630342 9 3782054 10 22692325 11 136153953 12 816923718 13 4901542310 14 29409253861 15 176455523169 16 1058733139014 17 6352398834086 18 38114393004517 19 228686358027105 20 1372118148162630