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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 338 |
| 2 | 21554 |
| 3 | 548418 |
| 4 | 7758530 |
| 5 | 72431762 |
| 6 | 495680562 |
| 7 | 2668186562 |
| 8 | 11873899778 |
| 9 | 45303445330 |
| 10 | 152290870706 |
| 11 | 460565724866 |
| 12 | 1273675451074 |
| 13 | 3262741154194 |
| 14 | 7822976222386 |
| 15 | 17705155093314 |
| 16 | 38088388507650 |
| 17 | 78337815542610 |
| 18 | 154794656025906 |
| 19 | 295082861864258 |
| 20 | 544593699459266 |
[1,338,21554,548418,7758530,72431762,495680562, 2668186562,11873899778,45303445330,152290870706, 460565724866,1273675451074,3262741154194, 7822976222386,17705155093314,38088388507650, 78337815542610,154794656025906,295082861864258, 544593699459266] |