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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 34 |
| 4 | 455 |
| 5 | 8710 |
| 6 | 230077 |
| 7 | 8285224 |
| 8 | 407456797 |
| 9 | 27587687551 |
| 10 | 2596034329278 |
| 11 | 342275007167359 |
| 12 | 63606742005546232 |
| 13 | 16730509857101195808 |
| 14 | 6246818082857455197662 |
| 15 | 3317816101992338134691233 |
| 16 | 2510420393373091580780786808 |
| 17 | 2709148467943025007607468405672 |
[1,1,4,34,455,8710,230077,8285224,407456797, 27587687551,2596034329278,342275007167359, 63606742005546232,16730509857101195808, 6246818082857455197662,3317816101992338134691233, 2510420393373091580780786808, 2709148467943025007607468405672] |