# A074252 (b-file synthesized from sequence entry) 0 1 1 4 2 12 3 30 4 84 5 9150 6 47244 7 75360 8 177287 9 281868 10 705790 11 3043504 12 9669715 13 20139930 14 32043111 15 67447484 16 291217662 17 7544909388 18 8396469108 19 21425170627