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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 15 |
| 6 | 10 |
| 7 | 271 |
| 8 | 840 |
| 9 | 8215 |
| 10 | 60870 |
| 11 | 423091 |
| 12 | 4980580 |
| 13 | 35126715 |
| 14 | 501501130 |
| 15 | 4192844111 |
| 16 | 63445348720 |
| 17 | 652228720015 |
| 18 | 10063325322190 |
| 19 | 125163350892331 |
| 20 | 1976669210391260 |
| 21 | 28804173376146115 |
[1,0,0,1,0,15,10,271,840,8215,60870,423091, 4980580,35126715,501501130,4192844111,63445348720, 652228720015,10063325322190,125163350892331, 1976669210391260,28804173376146115] |