# A090165 (b-file synthesized from sequence entry) 0 1 1 3 2 6 3 14 4 32 5 66 6 134 7 280 8 585 9 1214 10 2462 11 4946 12 9861 13 19600 14 38688 15 76086 16 148435 17 288098 18 554970 19 1062628 20 2016814 21 3800682 22 7093209 23 13127364 24 24053454 25 43657576 26 78382622 27 139237375