# A138549 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 62 6 282 7 1459 8 8375 9 52323 10 350676 11 2493846 12 18659787 13 145918295 14 1186129168 15 9978055080 16 86545684565 17 771571356565 18 7051538798490 19 65913863945775 20 628919704903746 21 6114899366942556 22 60492393411513722