# A148803 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 26 5 83 6 281 7 971 8 3417 9 12264 10 44438 11 162904 12 602266 13 2241764 14 8400548 15 31634918 16 119702435 17 454780012 18 1733848968 19 6631814922 20 25436402695 21 97810174385 22 376967520192 23 1455826275320 24 5632909116247 25 21831857984083 26 84746834213967 27 329439820828496 28 1282316672529298 29 4997344941893617