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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 | 18 |
| 4 | 121 |
| 5 | 1055 |
| 6 | 11376 |
| 7 | 145852 |
| 8 | 2165689 |
| 9 | 36532197 |
| 10 | 689873284 |
| 11 | 14415662558 |
| 12 | 330204013569 |
| 13 | 8226714806323 |
| 14 | 221470234531456 |
| 15 | 6406397898751320 |
| 16 | 198160750081637521 |
| 17 | 6526636388676159977 |
| 18 | 228040136335670652324 |
[1,1,4,18,121,1055,11376,145852,2165689,36532197, 689873284,14415662558,330204013569,8226714806323, 221470234531456,6406397898751320, 198160750081637521,6526636388676159977, 228040136335670652324] |