# A054449 (b-file synthesized from sequence entry) 0 1 1 4 2 14 3 46 4 144 5 436 6 1287 7 3724 8 10603 9 29788 10 82748 11 227658 12 621122 13 1682252 14 4526845 15 12111512 16 32237253 17 85407188 18 225318042 19 592141478 20 1550688932 21 4047787844 22 10534503523 23 27340763556 24 70777265551 25 182785072876