# A149215 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 10 4 42 5 136 6 591 7 2082 8 9311 9 34685 10 157638 11 608881 12 2797083 13 11084537 14 51304738 15 207277076 16 964911964 17 3957470838 18 18504551737 19 76820763679 20 360469021179 21 1511484050587 22 7112923455889 23 30076451061115 24 141879103647396 25 604235544127547 26 2856174424066251 27 12239406949509384