# A102880 (b-file synthesized from sequence entry) 0 1 1 1 2 0 3 2 4 8 5 22 6 64 7 198 8 624 9 1994 10 6464 11 21210 12 70296 13 234990 14 791424 15 2682894 16 9147360 17 31347730 18 107919232 19 373055730 20 1294372008 21 4506163718 22 15735793088 23 55105084246 24 193471595344 25 680891484762 26 2401575077568 27 8487950090954