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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 140 |
| 5 | 3317 |
| 6 | 121528 |
| 7 | 6119023 |
| 8 | 393990922 |
| 9 | 30967643569 |
| 10 | 2877662229666 |
| 11 | 308859441395270 |
| 12 | 37617620420277248 |
| 13 | 5127547379787329620 |
| 14 | 773519559519251515487 |
| 15 | 127966383690518560215307 |
| 16 | 23038617512398942817456756 |
[1,1,2,11,140,3317,121528,6119023,393990922, 30967643569,2877662229666,308859441395270, 37617620420277248,5127547379787329620, 773519559519251515487,127966383690518560215307, 23038617512398942817456756] |