# A275780 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 12 5 43 6 160 7 668 8 3098 9 15465 10 83100 11 477651 12 2914505 13 18795814 14 127790544 15 911448954 16 6808162094 17 53067398065 18 430956571977 19 3636314065247 20 31841519540324 21 288664242344692 22 2706949104147162 23 26205222185730884 24 261681461422075548 25 2691088457402830312