# A335457 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 31 5 80 6 196 7 486 8 1171 9 2787 10 6564 11 15323 12 35403 13 81251 14 185087 15 418918 16 942525 17 2109143 18 4695648 19 10405694 20 22959156