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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 19487171 |
| 2 | 2494357888 |
| 3 | 42618442977 |
| 4 | 319277809664 |
| 5 | 1522435234375 |
| 6 | 5455160701056 |
| 7 | 16048523266853 |
| 8 | 40867559636992 |
| 9 | 93206534790699 |
| 10 | 194871710000000 |
| 11 | 379749833583241 |
| 12 | 698260569735168 |
| 13 | 1222791080775407 |
[0,19487171,2494357888,42618442977,319277809664, 1522435234375,5455160701056,16048523266853, 40867559636992,93206534790699,194871710000000, 379749833583241,698260569735168,1222791080775407] |