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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 21 |
| 3 | 117 |
| 4 | 609 |
| 5 | 3093 |
| 6 | 15561 |
| 7 | 77997 |
| 8 | 390369 |
| 9 | 1952613 |
| 10 | 9764601 |
| 11 | 48826077 |
| 12 | 244136529 |
| 13 | 1220694933 |
| 14 | 6103499241 |
| 15 | 30517545357 |
| 16 | 152587825089 |
| 17 | 762939322053 |
| 18 | 3814697003481 |
| 19 | 19073485803837 |
| 20 | 95367430592049 |
| 21 | 476837156105973 |
| 22 | 2384185786821321 |
| 23 | 11920928946689517 |
[0,3,21,117,609,3093,15561,77997,390369,1952613, 9764601,48826077,244136529,1220694933,6103499241, 30517545357,152587825089,762939322053, 3814697003481,19073485803837,95367430592049, 476837156105973,2384185786821321, 11920928946689517] |