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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 342 |
| 3 | 6156 |
| 4 | 110637 |
| 5 | 1988388 |
| 6 | 35735751 |
| 7 | 642249324 |
| 8 | 11542621410 |
| 9 | 207446086881 |
| 10 | 3728258709552 |
| 11 | 67004941956759 |
| 12 | 1204224973728534 |
| 13 | 21642549713419572 |
| 14 | 388963830112221249 |
| 15 | 6990528525469894908 |
| 16 | 125635046969043641691 |
| 17 | 2257935858412484688900 |
| 18 | 40580032910411799982386 |
[1,19,342,6156,110637,1988388,35735751,642249324, 11542621410,207446086881,3728258709552, 67004941956759,1204224973728534,21642549713419572, 388963830112221249,6990528525469894908, 125635046969043641691,2257935858412484688900, 40580032910411799982386] |