# A170811 (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 14040 14 24284 15 42312 16 79340 17 152764 18 320920 19 688780 20 1577244 21 3763512 22 9412948