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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 30 |
| 4 | 118 |
| 5 | 462 |
| 6 | 1824 |
| 7 | 7208 |
| 8 | 28558 |
| 9 | 113274 |
| 10 | 449848 |
| 11 | 1787968 |
| 12 | 7111716 |
| 13 | 28303548 |
| 14 | 112700032 |
| 15 | 448939744 |
| 16 | 1788990454 |
| 17 | 7131191202 |
| 18 | 28433681832 |
| 19 | 113398298336 |
| 20 | 452345641820 |
| 21 | 1804739556100 |
| 22 | 7201621713568 |
| 23 | 28741559322464 |
| 24 | 114722405784428 |
| 25 | 457971605148996 |
| 26 | 1828422022584176 |
[1,2,8,30,118,462,1824,7208,28558,113274,449848, 1787968,7111716,28303548,112700032,448939744, 1788990454,7131191202,28433681832,113398298336, 452345641820,1804739556100,7201621713568, 28741559322464,114722405784428,457971605148996, 1828422022584176] |