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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 201 |
| 3 | 7375 |
| 4 | 312265 |
| 5 | 14365887 |
| 6 | 697859169 |
| 7 | 35226348087 |
| 8 | 1829569294665 |
| 9 | 97138289500735 |
| 10 | 5248514415816721 |
| 11 | 287657066913117447 |
| 12 | 15953440327189548001 |
| 13 | 893653778439275931175 |
| 14 | 50488236061157830951545 |
| 15 | 2873526763346873838886815 |
[1,7,201,7375,312265,14365887,697859169, 35226348087,1829569294665,97138289500735, 5248514415816721,287657066913117447, 15953440327189548001,893653778439275931175, 50488236061157830951545,2873526763346873838886815] |