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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 106 |
| 5 | 441 |
| 6 | 1913 |
| 7 | 8405 |
| 8 | 37758 |
| 9 | 170982 |
| 10 | 784866 |
| 11 | 3623326 |
| 12 | 16879640 |
| 13 | 78965889 |
| 14 | 371797947 |
| 15 | 1756213725 |
| 16 | 8335157567 |
| 17 | 39660909579 |
| 18 | 189405764982 |
| 19 | 906414415367 |
| 20 | 4350153987934 |
| 21 | 20913639508721 |
| 22 | 100775558575863 |
| 23 | 486305001210289 |
| 24 | 2351158641458940 |
| 25 | 11381247702362433 |
| 26 | 55179764580772287 |
| 27 | 267812212122830377 |
[1,2,7,26,106,441,1913,8405,37758,170982,784866, 3623326,16879640,78965889,371797947,1756213725, 8335157567,39660909579,189405764982,906414415367, 4350153987934,20913639508721,100775558575863, 486305001210289,2351158641458940, 11381247702362433,55179764580772287, 267812212122830377] |