# A150078 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 18 4 68 5 224 6 866 7 3044 8 11856 9 42830 10 168438 11 619340 12 2452088 13 9130458 14 36233300 15 136303418 16 541799748 17 2052445408 18 8171539956 19 31128440400 20 124091086076 21 474862499816 22 1894225928704 23 7277083362774 24 29042937826756 25 111923855247554 26 446900167922820 27 1726852464248602