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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 331 |
| 3 | 3964 |
| 4 | 57020 |
| 5 | 725080 |
| 6 | 9014839 |
| 7 | 108971358 |
| 8 | 1293374998 |
| 9 | 15124830042 |
| 10 | 174840029210 |
| 11 | 2002005705582 |
| 12 | 22744617716405 |
| 13 | 256690848493684 |
| 14 | 2880580641585200 |
| 15 | 32167728035568302 |
| 16 | 357685528356070536 |
| 17 | 3962274174725426092 |
| 18 | 43745566808355289539 |
| 19 | 481531500069734159312 |
[0,8,331,3964,57020,725080,9014839,108971358, 1293374998,15124830042,174840029210,2002005705582, 22744617716405,256690848493684,2880580641585200, 32167728035568302,357685528356070536, 3962274174725426092,43745566808355289539, 481531500069734159312] |