The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 30 |
| 3 | 272 |
| 4 | 2695 |
| 5 | 28080 |
| 6 | 302064 |
| 7 | 3321120 |
| 8 | 37095201 |
| 9 | 419276660 |
| 10 | 4782798020 |
| 11 | 54960207120 |
| 12 | 635339153865 |
| 13 | 7380876649216 |
| 14 | 86101923008160 |
| 15 | 1007980225327680 |
| 16 | 11836181297108565 |
| 17 | 139353762142502100 |
[1,4,30,272,2695,28080,302064,3321120,37095201, 419276660,4782798020,54960207120,635339153865, 7380876649216,86101923008160,1007980225327680, 11836181297108565,139353762142502100] |