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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 18 |
| 3 | 90 |
| 4 | 510 |
| 5 | 3087 |
| 6 | 19424 |
| 7 | 125442 |
| 8 | 826622 |
| 9 | 5532723 |
| 10 | 37492330 |
| 11 | 256611656 |
| 12 | 1770847429 |
| 13 | 12304993349 |
| 14 | 86006708200 |
[5,18,90,510,3087,19424,125442,826622,5532723, 37492330,256611656,1770847429,12304993349, 86006708200] |