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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 57 |
| 4 | 294 |
| 5 | 1590 |
| 6 | 8856 |
| 7 | 50301 |
| 8 | 289590 |
| 9 | 1683306 |
| 10 | 9853320 |
| 11 | 57977922 |
| 12 | 342494118 |
| 13 | 2029350972 |
| 14 | 12052664868 |
| 15 | 71715479535 |
| 16 | 427347761010 |
| 17 | 2549540104944 |
| 18 | 15224944518084 |
| 19 | 90988367614254 |
| 20 | 544115710748898 |
| 21 | 3255541325220204 |
| 22 | 19486893225315138 |
| 23 | 116685749052336714 |
[1,3,12,57,294,1590,8856,50301,289590,1683306, 9853320,57977922,342494118,2029350972,12052664868, 71715479535,427347761010,2549540104944, 15224944518084,90988367614254,544115710748898, 3255541325220204,19486893225315138, 116685749052336714] |