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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 28 |
| 5 | 271 |
| 6 | 3351 |
| 7 | 50478 |
| 8 | 896848 |
| 9 | 18362109 |
| 10 | 425695015 |
| 11 | 11023082676 |
| 12 | 315332380452 |
| 13 | 9876127761371 |
| 14 | 336120888377743 |
| 15 | 12351836713047770 |
| 16 | 487443031053702976 |
| 17 | 20559664804361256953 |
| 18 | 923012267234425940655 |
| 19 | 43944912052993796265952 |
| 20 | 2211595951039098481159300 |
[1,1,4,28,271,3351,50478,896848,18362109, 425695015,11023082676,315332380452,9876127761371, 336120888377743,12351836713047770, 487443031053702976,20559664804361256953, 923012267234425940655,43944912052993796265952, 2211595951039098481159300] |