# A148707 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 23 5 75 6 263 7 859 8 3027 9 10847 10 40277 11 148941 12 558955 13 2091905 14 7964021 15 30592053 16 118488259 17 459892963 18 1797038297 19 7045304575 20 27753725487 21 109797374923 22 436241707057 23 1738515110135 24 6952220014915 25 27871651746743 26 111995783605643 27 451202149489489 28 1822864384511955