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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 250 |
| 2 | 4262 |
| 3 | 31928 |
| 4 | 152244 |
| 5 | 545517 |
| 6 | 1604853 |
| 7 | 4086756 |
| 8 | 9320654 |
| 9 | 10070211 |
| 10 | 20892885 |
| 11 | 40458488 |
| 12 | 74002500 |
| 13 | 129017276 |
| 14 | 215914886 |
| 15 | 348808796 |
| 16 | 546424205 |
| 17 | 833146874 |
| 18 | 1240220256 |
| 19 | 1288986925 |
| 20 | 1874378945 |
| 21 | 2674289273 |
| 22 | 3750591998 |
[2,250,4262,31928,152244,545517,1604853,4086756, 9320654,10070211,20892885,40458488,74002500, 129017276,215914886,348808796,546424205,833146874, 1240220256,1288986925,1874378945,2674289273, 3750591998] |