# A149027 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 39 5 143 6 645 7 2603 8 12089 9 51843 10 244625 11 1085225 12 5172639 13 23504709 14 112876019 15 521562001 16 2517993407 17 11779732141 18 57108894755 19 269728321329 20 1311947665271 21 6242539439513 22 30444460089423 23 145731077374047 24 712289602626021 25 3426187222066247 26 16777120269058485 27 81025572922970219