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| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 45 |
| 2 | 117 |
| 3 | 213 |
| 4 | -171 |
| 5 | -4779 |
| 6 | -35499 |
| 7 | -207531 |
| 8 | -1092267 |
| 9 | -5417643 |
| 10 | -25864875 |
| 11 | -120236715 |
| 12 | -548055723 |
| 13 | -2460658347 |
| 14 | -10916375211 |
| 15 | -47960468139 |
| 16 | -209021741739 |
| 17 | -904806443691 |
| 18 | -3894103681707 |
| 19 | -16675926354603 |
| 20 | -71101751929515 |
| 21 | -301999193762475 |
| 22 | -1278365519227563 |
[15,45,117,213,-171,-4779,-35499,-207531,-1092267, -5417643,-25864875,-120236715,-548055723, -2460658347,-10916375211,-47960468139, -209021741739,-904806443691,-3894103681707, -16675926354603,-71101751929515,-301999193762475, -1278365519227563] |