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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 | 6 |
| 2 | 24 |
| 3 | 90 |
| 4 | 324 |
| 5 | 1166 |
| 6 | 4138 |
| 7 | 14730 |
| 8 | 51992 |
| 9 | 183898 |
| 10 | 646980 |
| 11 | 2279702 |
| 12 | 8002976 |
| 13 | 28127418 |
| 14 | 98585096 |
| 15 | 345848306 |
| 16 | 1210704274 |
| 17 | 4241348770 |
| 18 | 14833284544 |
| 19 | 51907058582 |
| 20 | 181392476966 |
| 21 | 634197818374 |
| 22 | 2214804822718 |
| 23 | 7737946227490 |
[1,6,24,90,324,1166,4138,14730,51992,183898, 646980,2279702,8002976,28127418,98585096, 345848306,1210704274,4241348770,14833284544, 51907058582,181392476966,634197818374, 2214804822718,7737946227490] |