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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 48 |
| 3 | 35 |
| 4 | 537 |
| 5 | 7116 |
| 6 | 26670 |
| 7 | 258389 |
| 8 | 3071901 |
| 9 | 19928263 |
| 10 | 176455672 |
| 11 | 1809072597 |
| 12 | 14432387010 |
| 13 | 126012759700 |
| 14 | 1190918179320 |
| 15 | 10214845847461 |
| 16 | 89578878110512 |
| 17 | 815753700411980 |
| 18 | 7168609782631684 |
| 19 | 63210709944186782 |
| 20 | 566786592965748079 |
[0,48,35,537,7116,26670,258389,3071901,19928263, 176455672,1809072597,14432387010,126012759700, 1190918179320,10214845847461,89578878110512, 815753700411980,7168609782631684, 63210709944186782,566786592965748079] |