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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 3 |
| 3 | 15 |
| 4 | 63 |
| 5 | 213 |
| 6 | 687 |
| 7 | 2127 |
| 8 | 6483 |
| 9 | 19575 |
| 10 | 58905 |
| 11 | 176943 |
| 12 | 531177 |
| 13 | 1593981 |
| 14 | 4782513 |
| 15 | 14348289 |
| 16 | 43045923 |
| 17 | 129139119 |
| 18 | 387419097 |
| 19 | 1162259637 |
| 20 | 3486782013 |
| 21 | 10460350023 |
| 22 | 31381055463 |
| 23 | 94143173409 |
[0,0,3,15,63,213,687,2127,6483,19575,58905,176943, 531177,1593981,4782513,14348289,43045923, 129139119,387419097,1162259637,3486782013, 10460350023,31381055463,94143173409] |