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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 9 |
| 4 | 6 |
| 5 | 643 |
| 6 | 182 |
| 7 | 118953 |
| 8 | 6019 |
| 9 | 242630 |
| 10 | 2243190 |
| 11 | 25938251679 |
| 12 | 78106516 |
| 13 | 23349992199606 |
| 14 | 288964822371 |
| 15 | 46755212195033 |
| 16 | 226472341461312 |
| 17 | 48661337027901364945 |
| 18 | 18066374340919781 |
| 19 | 104224677113940850317679 |
| 20 | 440728415311733637734 |
| 21 | 208546898802899685866735 |
| 22 | 972477473959172989443327 |
[1,0,2,9,6,643,182,118953,6019,242630,2243190, 25938251679,78106516,23349992199606,288964822371, 46755212195033,226472341461312, 48661337027901364945,18066374340919781, 104224677113940850317679,440728415311733637734, 208546898802899685866735,972477473959172989443327] |