| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 394 |
| 3 | 4230 |
| 4 | 52922 |
| 5 | 674830 |
| 6 | 8809642 |
| 7 | 116602894 |
| 8 | 1559751802 |
| 9 | 21029229666 |
| 10 | 285256118294 |
| 11 | 3887818433694 |
| 12 | 53185566799370 |
| 13 | 729717040661210 |
| 14 | 10035018502900680 |
| 15 | 138252138183877000 |
| 16 | 1907423508604126538 |
[1,30,394,4230,52922,674830,8809642,116602894, 1559751802,21029229666,285256118294,3887818433694, 53185566799370,729717040661210,10035018502900680, 138252138183877000,1907423508604126538] |