# A221783 (b-file synthesized from sequence entry) 1 0 2 3 3 5 4 16 5 41 6 105 7 288 8 735 9 1981 10 5156 11 13685 12 35973 13 94940 14 250271 15 659721 16 1739740 17 4585933 18 12092245 19 31878636 20 84050611 21 221594145 22 584232168 23 1540316025