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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 16 |
| 3 | 61 |
| 4 | 236 |
| 5 | 912 |
| 6 | 3525 |
| 7 | 13624 |
| 8 | 52656 |
| 9 | 203513 |
| 10 | 786568 |
| 11 | 3040048 |
| 12 | 11749641 |
| 13 | 45411804 |
| 14 | 175514464 |
| 15 | 678355061 |
| 16 | 2621810068 |
| 17 | 10133171296 |
| 18 | 39164225421 |
| 19 | 151367869744 |
| 20 | 585029621920 |
| 21 | 2261111681777 |
| 22 | 8739089177552 |
| 23 | 33776164295072 |
[4,16,61,236,912,3525,13624,52656,203513,786568, 3040048,11749641,45411804,175514464,678355061, 2621810068,10133171296,39164225421,151367869744, 585029621920,2261111681777,8739089177552, 33776164295072] |