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) |
|---|---|
| 1 | 0 |
| 2 | 15 |
| 3 | 253 |
| 4 | 1653 |
| 5 | 6786 |
| 6 | 21115 |
| 7 | 54615 |
| 8 | 123753 |
| 9 | 253828 |
| 10 | 481671 |
| 11 | 858705 |
| 12 | 1454365 |
| 13 | 2359878 |
| 14 | 3692403 |
| 15 | 5599531 |
| 16 | 8264145 |
| 17 | 11909640 |
| 18 | 16805503 |
| 19 | 23273253 |
| 20 | 31692741 |
| 21 | 42508810 |
| 22 | 56238315 |
| 23 | 73477503 |
| 24 | 94909753 |
| 25 | 121313676 |
| 26 | 153571575 |
| 27 | 192678265 |
[0,15,253,1653,6786,21115,54615,123753,253828, 481671,858705,1454365,2359878,3692403,5599531, 8264145,11909640,16805503,23273253,31692741, 42508810,56238315,73477503,94909753,121313676, 153571575,192678265] |