# A148808 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 26 5 84 6 315 7 1155 8 4479 9 17879 10 72237 11 298920 12 1254329 13 5323120 14 22882116 15 99271167 16 434160320 17 1915240840 18 8499435683 19 37968001495 20 170538467281 21 769755420661 22 3491044143734 23 15897506282629 24 72677164291744 25 333440276296060 26 1534802275386455 27 7086364716511872 28 32811176928714466