# A148389 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 51 6 175 7 603 8 2179 9 7966 10 30115 11 115175 12 447599 13 1754566 14 6960211 15 27838776 16 112401002 17 457156790 18 1872092533 19 7709515518 20 31925277406 21 132858964434 22 555535209096 23 2332992606313 24 9836786434533 25 41626228814418 26 176751460040269 27 752917025247036 28 3216949479854651