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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 93 |
| 5 | 652 |
| 6 | 6369 |
| 7 | 79568 |
| 8 | 1256425 |
| 9 | 24058631 |
| 10 | 543204998 |
| 11 | 14138916124 |
| 12 | 417362929209 |
| 13 | 13798729189578 |
| 14 | 505990335048034 |
| 15 | 20415765544541866 |
| 16 | 900364519682003919 |
| 17 | 43155049922002494115 |
| 18 | 2236988329443856718604 |
| 19 | 124862936181977439454012 |
| 20 | 7476052709321753156375756 |
| 21 | 478506183522725779096476581 |
| 22 | 32638841238874891261354722405 |
| 23 | 2365895836144423508306322639848 |
| 24 | 181785988254681334224483607437510 |
| 25 | 14771116583797935886529061991645404 |
| 26 | 1266545494725474774697216198539818982 |
[1,1,4,16,93,652,6369,79568,1256425,24058631, 543204998,14138916124,417362929209,13798729189578, 505990335048034,20415765544541866, 900364519682003919,43155049922002494115, 2236988329443856718604,124862936181977439454012, 7476052709321753156375756, 478506183522725779096476581, 32638841238874891261354722405, 2365895836144423508306322639848, 181785988254681334224483607437510, 14771116583797935886529061991645404, 1266545494725474774697216198539818982] |