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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 20 |
| 4 | 512 |
| 5 | 25392 |
| 6 | 2093472 |
| 7 | 260555392 |
| 8 | 45819233280 |
| 9 | 10849051434240 |
| 10 | 3334632688448000 |
| 11 | 1292876470540099584 |
| 12 | 617862114722159788032 |
| 13 | 357118557050589336432640 |
| 14 | 245715466325821945360588800 |
| 15 | 198568949299946066906578944000 |
| 16 | 186309450278791634742517692366848 |
[1,2,20,512,25392,2093472,260555392,45819233280, 10849051434240,3334632688448000, 1292876470540099584,617862114722159788032, 357118557050589336432640, 245715466325821945360588800, 198568949299946066906578944000, 186309450278791634742517692366848] |