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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 250 |
| 3 | 2130 |
| 4 | 18290 |
| 5 | 157782 |
| 6 | 1365186 |
| 7 | 11836674 |
| 8 | 102784246 |
| 9 | 893546734 |
| 10 | 7774696328 |
| 11 | 67691981738 |
| 12 | 589674316476 |
| 13 | 5138751184130 |
| 14 | 44795493135264 |
| 15 | 390582096696514 |
| 16 | 3406186539096420 |
| 17 | 29708773287301186 |
| 18 | 259147729207407892 |
[1,30,250,2130,18290,157782,1365186,11836674, 102784246,893546734,7774696328,67691981738, 589674316476,5138751184130,44795493135264, 390582096696514,3406186539096420, 29708773287301186,259147729207407892] |