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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 23 |
| 2 | 142 |
| 3 | 914 |
| 4 | 6016 |
| 5 | 40052 |
| 6 | 268168 |
| 7 | 1800536 |
| 8 | 12105664 |
| 9 | 81444848 |
| 10 | 548123872 |
| 11 | 3689452064 |
| 12 | 24835795456 |
| 13 | 167190009152 |
| 14 | 1125512591488 |
| 15 | 7576945713536 |
| 16 | 51008180122624 |
| 17 | 343388995528448 |
| 18 | 2311709992586752 |
| 19 | 15562542024241664 |
[4,23,142,914,6016,40052,268168,1800536,12105664, 81444848,548123872,3689452064,24835795456, 167190009152,1125512591488,7576945713536, 51008180122624,343388995528448,2311709992586752, 15562542024241664] |