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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 30 |
| 4 | 22 |
| 5 | 3130 |
| 6 | 846 |
| 7 | 823550 |
| 8 | 278 |
| 9 | 19713 |
| 10 | 9769842 |
| 11 | 285311670622 |
| 12 | 536480 |
| 13 | 302875106592266 |
| 14 | 678223912966 |
| 15 | 30531930560 |
| 16 | 65814 |
| 17 | 827240261886336764194 |
| 18 | 387703674 |
| 19 | 1978419655660313589123998 |
| 20 | 95367442459684 |
| 21 | 558545874544463320 |
| 22 | 81402749387125076980422 |
| 23 | 20880467999847912034355032910590 |
[0,6,30,22,3130,846,823550,278,19713,9769842, 285311670622,536480,302875106592266,678223912966, 30531930560,65814,827240261886336764194,387703674, 1978419655660313589123998,95367442459684, 558545874544463320,81402749387125076980422, 20880467999847912034355032910590] |