# A019487 (b-file synthesized from sequence entry) 0 2 1 6 2 17 3 48 4 135 5 379 6 1064 7 2987 8 8385 9 23538 10 66075 11 185483 12 520680 13 1461631 14 4103029 15 11517850 16 32332423 17 90762215 18 254783864 19 715218523 20 2007731289 21 5636018642 22 15821193955 23 44412588755 24 124673147016 25 349977202919