# A149019 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 35 5 131 6 539 7 2178 8 9466 9 39944 10 178102 11 779382 12 3535378 13 15837243 14 72810285 15 331162556 16 1538465914 17 7082275082 18 33160005984 19 154175852070 20 726421380590 21 3403523284138 22 16121460813022 23 75997260757594 24 361573678921754 25 1713363345487223 26 8182019330408203 27 38944062120025760