# A147250 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 1 6 3 7 7 8 15 9 31 10 125 11 537 12 2497 13 11379 14 73403 15 564557 16 5044749 17 48150503 18 565823439 19 7944991263 20 131881718303 21 2468412664385