# A089735 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 6 4 13 5 28 6 62 7 140 8 320 9 740 10 1728 11 4068 12 9645 13 23010 14 55195 15 133042 16 322078 17 782758 18 1909091 19 4671098 20 11462607 21 28204212 22 69569278 23 171993316 24 426111203 25 1057757858 26 2630527679 27 6552998126 28 16350465147 29 40857321696 30 102239831436