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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 31 |
| 4 | 379 |
| 5 | 6556 |
| 6 | 150349 |
| 7 | 4373461 |
| 8 | 156297964 |
| 9 | 6698486371 |
| 10 | 337789490599 |
| 11 | 19738202807236 |
| 12 | 1319703681935929 |
| 13 | 99896787342523081 |
| 14 | 8484301665702298804 |
| 15 | 802221679220975886631 |
| 16 | 83877585692383961052499 |
| 17 | 9640193854278691671399436 |
| 18 | 1211499609050804749310115589 |
[1,1,4,31,379,6556,150349,4373461,156297964, 6698486371,337789490599,19738202807236, 1319703681935929,99896787342523081, 8484301665702298804,802221679220975886631, 83877585692383961052499,9640193854278691671399436, 1211499609050804749310115589] |