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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 40 |
| 3 | 2076 |
| 4 | 48316 |
| 5 | 620568 |
| 6 | 14777316 |
| 7 | 246091276 |
| 8 | 3081824360 |
| 9 | 43744483080 |
| 10 | 658808677292 |
| 11 | 8732713535100 |
| 12 | 101911005390840 |
| 13 | 1638761493877308 |
| 14 | 20319539313941196 |
| 15 | 274686278842189276 |
[0,40,2076,48316,620568,14777316,246091276, 3081824360,43744483080,658808677292,8732713535100, 101911005390840,1638761493877308, 20319539313941196,274686278842189276] |