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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 34 |
| 3 | 153 |
| 4 | 711 |
| 5 | 3067 |
| 6 | 10920 |
| 7 | 30818 |
| 8 | 70640 |
| 9 | 138558 |
| 10 | 242764 |
| 11 | 391450 |
| 12 | 592808 |
| 13 | 855030 |
| 14 | 1186308 |
| 15 | 1594834 |
| 16 | 2088800 |
| 17 | 2676398 |
| 18 | 3365820 |
| 19 | 4165258 |
| 20 | 5082904 |
| 21 | 6126950 |
| 22 | 7305588 |
| 23 | 8627010 |
| 24 | 10099408 |
| 25 | 11730974 |
| 26 | 13529900 |
| 27 | 15504378 |
| 28 | 17662600 |
| 29 | 20012758 |
| 30 | 22563044 |
[8,34,153,711,3067,10920,30818,70640,138558, 242764,391450,592808,855030,1186308,1594834, 2088800,2676398,3365820,4165258,5082904,6126950, 7305588,8627010,10099408,11730974,13529900, 15504378,17662600,20012758,22563044] |