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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 146 |
| 5 | 3060 |
| 6 | 101642 |
| 7 | 5106612 |
| 8 | 377403266 |
| 9 | 40299722580 |
| 10 | 6138497261882 |
| 11 | 1320327172853172 |
| 12 | 397571105288091506 |
| 13 | 166330355795371103700 |
| 14 | 96036130723851671469482 |
| 15 | 76070282980382554147600692 |
| 16 | 82226869197428315925408327266 |
| 17 | 120722306604121583767045993825620 |
| 18 | 239727397782668638856762574296226842 |
[1,1,2,12,146,3060,101642,5106612,377403266, 40299722580,6138497261882,1320327172853172, 397571105288091506,166330355795371103700, 96036130723851671469482, 76070282980382554147600692, 82226869197428315925408327266, 120722306604121583767045993825620, 239727397782668638856762574296226842] |