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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 | 0 |
| 2 | 3 |
| 3 | 18 |
| 4 | 195 |
| 5 | 2730 |
| 6 | 47745 |
| 7 | 1001742 |
| 8 | 24523401 |
| 9 | 686190258 |
| 10 | 21601161015 |
| 11 | 755533274826 |
| 12 | 29066119327179 |
| 13 | 1219715093642838 |
| 14 | 55441103383640793 |
| 15 | 2713468284508412430 |
| 16 | 142269924567096468177 |
| 17 | 7955396173559375208426 |
| 18 | 472576083221524737100311 |
[1,0,3,18,195,2730,47745,1001742,24523401, 686190258,21601161015,755533274826,29066119327179, 1219715093642838,55441103383640793, 2713468284508412430,142269924567096468177, 7955396173559375208426,472576083221524737100311] |