# A149489 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 14 4 52 5 209 6 860 7 3611 8 15470 9 67075 10 293936 11 1299135 12 5782369 13 25890073 14 116507143 15 526584341 16 2389109731 17 10875671609 18 49655540621 19 227316843705 20 1043115351009 21 4797021425961 22 22103655032502 23 102032014882075 24 471763934655236 25 2184603451900384 26 10130495327004170 27 47038661457594876