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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 527 |
| 3 | 6510 |
| 4 | 65162 |
| 5 | 559271 |
| 6 | 4259276 |
| 7 | 29444575 |
| 8 | 187761854 |
| 9 | 1117650502 |
| 10 | 6267006128 |
| 11 | 33341859350 |
| 12 | 169281687755 |
| 13 | 824110662334 |
| 14 | 3862233690794 |
| 15 | 17483338870409 |
| 16 | 76663232042998 |
| 17 | 326438219863590 |
[1,31,527,6510,65162,559271,4259276,29444575, 187761854,1117650502,6267006128,33341859350, 169281687755,824110662334,3862233690794, 17483338870409,76663232042998,326438219863590] |