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A004211 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 49 |
| 5 | 257 |
| 6 | 1539 |
| 7 | 10299 |
| 8 | 75905 |
| 9 | 609441 |
| 10 | 5284451 |
| 11 | 49134923 |
| 12 | 487026929 |
| 13 | 5120905441 |
| 14 | 56878092067 |
| 15 | 664920021819 |
| 16 | 8155340557697 |
| 17 | 104652541401025 |
| 18 | 1401572711758403 |
| 19 | 19546873773314571 |
| 20 | 283314887789276721 |
| 21 | 4259997696504874817 |
| 22 | 66341623494636864963 |
[1,1,3,11,49,257,1539,10299,75905,609441,5284451, 49134923,487026929,5120905441,56878092067, 664920021819,8155340557697,104652541401025, 1401572711758403,19546873773314571, 283314887789276721,4259997696504874817, 66341623494636864963] |