# A093833 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 24 4 76 5 232 6 708 7 2144 8 6476 9 19512 10 58708 11 176464 12 530076 13 1591592 14 4777508 15 14337984 16 43024876 17 129096472 18 387333108 19 1162086704 20 3486434876 21 10459654152 22 31379661508 23 94140382624 24 282423944076 25 847277424632