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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 30 |
| 4 | 122 |
| 5 | 522 |
| 6 | 2256 |
| 7 | 9962 |
| 8 | 44796 |
| 9 | 202794 |
| 10 | 927606 |
| 11 | 4280380 |
| 12 | 19845134 |
| 13 | 92551574 |
| 14 | 433896100 |
| 15 | 2040965858 |
| 16 | 9637093830 |
| 17 | 45662395760 |
| 18 | 216890822656 |
| 19 | 1032968093538 |
| 20 | 4931746517340 |
| 21 | 23590284027536 |
| 22 | 113064621405454 |
| 23 | 542898978102980 |
| 24 | 2610696774382372 |
| 25 | 12573536548269058 |
| 26 | 60642739428964046 |
[1,2,8,30,122,522,2256,9962,44796,202794,927606, 4280380,19845134,92551574,433896100,2040965858, 9637093830,45662395760,216890822656,1032968093538, 4931746517340,23590284027536,113064621405454, 542898978102980,2610696774382372, 12573536548269058,60642739428964046] |