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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 36 |
| 3 | 298 |
| 4 | 7929 |
| 5 | 77053 |
| 6 | 2601092 |
| 7 | 28654054 |
| 8 | 1031825766 |
| 9 | 11887826140 |
| 10 | 435680320590 |
| 11 | 5083894845555 |
| 12 | 187837607291427 |
| 13 | 2206718413576904 |
| 14 | 81926552529032816 |
| 15 | 966535136365083102 |
| 16 | 36010552757817373905 |
[4,36,298,7929,77053,2601092,28654054,1031825766, 11887826140,435680320590,5083894845555, 187837607291427,2206718413576904, 81926552529032816,966535136365083102, 36010552757817373905] |