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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 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 37 |
| 5 | 152 |
| 6 | 574 |
| 7 | 2069 |
| 8 | 8899 |
| 9 | 35891 |
| 10 | 140144 |
| 11 | 615525 |
| 12 | 2574434 |
| 13 | 10492758 |
| 14 | 46743782 |
| 15 | 200030677 |
| 16 | 837407785 |
| 17 | 3767614082 |
| 18 | 16377824578 |
| 19 | 69844474502 |
| 20 | 316532390515 |
| 21 | 1391809504822 |
| 22 | 6016378322607 |
| 23 | 27419222675191 |
| 24 | 121620817600079 |
| 25 | 531194563076276 |
| 26 | 2431701864824115 |
| 27 | 10860600611853955 |
[1,1,4,12,37,152,574,2069,8899,35891,140144, 615525,2574434,10492758,46743782,200030677, 837407785,3767614082,16377824578,69844474502, 316532390515,1391809504822,6016378322607, 27419222675191,121620817600079,531194563076276, 2431701864824115,10860600611853955] |