# A120900 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 19 5 62 6 209 7 722 8 2539 9 9054 10 32654 11 118876 12 436171 13 1611067 14 5984943 15 22344455 16 83786875 17 315397144 18 1191324649 19 4513742858 20 17149228138 21 65318912291 22 249356597492 23 953902701488 24 3656057618727 25 14037222220896