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A356285 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 22 |
| 3 | 214 |
| 4 | 1509 |
| 5 | 12770 |
| 6 | 107884 |
| 7 | 874365 |
| 8 | 6834843 |
| 9 | 56722759 |
| 10 | 463069914 |
| 11 | 3666488610 |
| 12 | 29512199193 |
| 13 | 233492075573 |
| 14 | 1858649112464 |
| 15 | 14890457067926 |
| 16 | 117154630898329 |
| 17 | 917101099859767 |
| 18 | 7257072314543086 |
| 19 | 56653800922475280 |
| 20 | 442687465112658972 |
| 21 | 3467083846726752495 |
[1,4,22,214,1509,12770,107884,874365,6834843, 56722759,463069914,3666488610,29512199193, 233492075573,1858649112464,14890457067926, 117154630898329,917101099859767,7257072314543086, 56653800922475280,442687465112658972, 3467083846726752495] |