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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 38 |
| 3 | 1420 |
| 4 | 11020 |
| 5 | 92478 |
| 6 | 415650 |
| 7 | 1756472 |
| 8 | 5497304 |
| 9 | 16089370 |
| 10 | 39798430 |
| 11 | 93260292 |
| 12 | 196688868 |
| 13 | 397729430 |
| 14 | 748819610 |
| 15 | 1364059888 |
| 16 | 2360459440 |
| 17 | 3978481842 |
| 18 | 6452033814 |
| 19 | 10241689340 |
| 20 | 15777507260 |
| 21 | 23878671982 |
| 22 | 35285572498 |
| 23 | 51371705640 |
[2,38,1420,11020,92478,415650,1756472,5497304, 16089370,39798430,93260292,196688868,397729430, 748819610,1364059888,2360459440,3978481842, 6452033814,10241689340,15777507260,23878671982, 35285572498,51371705640] |