# A170812 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 12 5 40 6 116 7 200 8 444 9 760 10 2160 11 4368 12 7852 13 12828 14 17252 15 21136 16 28716 17 37276 18 53624 19 76740 20 114856 21 180232 22 290280