# A048771 (b-file synthesized from sequence entry) 0 1 1 9 2 26 3 68 4 169 5 413 6 1002 7 2424 8 5857 9 14145 10 34154 11 82460 12 199081 13 480629 14 1160346 15 2801328 16 6763009 17 16327353 18 39417722 19 95162804 20 229743337 21 554649485 22 1339042314 23 3232734120 24 7804510561 25 18841755249 26 45488021066 27 109817797388 28 265123615849