# A059412 (b-file synthesized from sequence entry) 1 2 2 4 3 12 4 30 5 78 6 180 7 432 8 978 9 2220 10 4926 11 10908 12 23790 13 51750 14 111564 15 239604 16 511758 17 1089306 18 2309118 19 4880946 20 10285146 21 21619770 22 45334776 23 94865904 24 198116082 25 413013684 26 859573638 27 1786263822 28 3706729488 29 7681910826