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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 34 |
| 4 | 149 |
| 5 | 655 |
| 6 | 2973 |
| 7 | 13542 |
| 8 | 63195 |
| 9 | 295239 |
| 10 | 1391221 |
| 11 | 6607775 |
| 12 | 31486131 |
| 13 | 150555115 |
| 14 | 723726889 |
| 15 | 3484954560 |
| 16 | 16822569925 |
| 17 | 81467300557 |
| 18 | 395050078051 |
| 19 | 1918852327159 |
| 20 | 9340849113167 |
| 21 | 45516027448659 |
| 22 | 222061163876035 |
| 23 | 1085070839303991 |
| 24 | 5306236098700501 |
| 25 | 25972730345997923 |
| 26 | 127277059787467059 |
[1,2,9,34,149,655,2973,13542,63195,295239,1391221, 6607775,31486131,150555115,723726889,3484954560, 16822569925,81467300557,395050078051, 1918852327159,9340849113167,45516027448659, 222061163876035,1085070839303991,5306236098700501, 25972730345997923,127277059787467059] |