# A149031 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 10 4 33 5 127 6 486 7 1943 8 8052 9 33504 10 143203 11 618615 12 2696818 13 11919409 14 52965105 15 237386849 16 1071312485 17 4857376568 18 22160738643 19 101518175550 20 467022106982 21 2157328576831 22 9996509638302 23 46480743976377 24 216739174880976 25 1013326106030851 26 4750067786683020 27 22315803215975305