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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 102 |
| 5 | 429 |
| 6 | 1830 |
| 7 | 8036 |
| 8 | 35925 |
| 9 | 162302 |
| 10 | 743408 |
| 11 | 3430182 |
| 12 | 15952398 |
| 13 | 74673066 |
| 14 | 351264524 |
| 15 | 1660622930 |
| 16 | 7880737509 |
| 17 | 37532986236 |
| 18 | 179320488307 |
| 19 | 859048118661 |
| 20 | 4125766305208 |
| 21 | 19858333412689 |
| 22 | 95775646163821 |
| 23 | 462765278447218 |
| 24 | 2239646828682571 |
| 25 | 10855749266252074 |
| 26 | 52691370466962455 |
| 27 | 256078519963721463 |
[1,2,7,26,102,429,1830,8036,35925,162302,743408, 3430182,15952398,74673066,351264524,1660622930, 7880737509,37532986236,179320488307,859048118661, 4125766305208,19858333412689,95775646163821, 462765278447218,2239646828682571, 10855749266252074,52691370466962455, 256078519963721463] |