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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 395 |
| 3 | 2258 |
| 4 | 11177 |
| 5 | 39066 |
| 6 | 115437 |
| 7 | 649836 |
| 8 | 2588243 |
| 9 | 7860952 |
| 10 | 20320619 |
| 11 | 45638364 |
| 12 | 93764799 |
| 13 | 177392152 |
| 14 | 386650439 |
| 15 | 769301460 |
| 16 | 1432768935 |
| 17 | 2497732488 |
| 18 | 4158929163 |
| 19 | 6601793994 |
| 20 | 10107028541 |
[2,395,2258,11177,39066,115437,649836,2588243, 7860952,20320619,45638364,93764799,177392152, 386650439,769301460,1432768935,2497732488, 4158929163,6601793994,10107028541] |