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| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 16 |
| 2 | 31 |
| 3 | 78 |
| 4 | 265 |
| 5 | 4053 |
| 6 | 12424 |
| 7 | 28901 |
| 8 | 41325 |
| 9 | 70226 |
| 10 | 2148105 |
| 11 | 2218331 |
| 12 | 4366436 |
| 13 | 10951203 |
| 14 | 37220045 |
| 15 | 569251878 |
| 16 | 1744975679 |
| 17 | 4059203236 |
| 18 | 5804178915 |
| 19 | 9863382151 |
| 20 | 301705643445 |
| 21 | 311569025596 |
| 22 | 613274669041 |
| 23 | 1538118363678 |
| 24 | 5227629760075 |
| 25 | 79952564764803 |
[15,16,31,78,265,4053,12424,28901,41325,70226, 2148105,2218331,4366436,10951203,37220045, 569251878,1744975679,4059203236,5804178915, 9863382151,301705643445,311569025596,613274669041, 1538118363678,5227629760075,79952564764803] |