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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 | 13 |
| 4 | 41 |
| 5 | 125 |
| 6 | 374 |
| 7 | 1103 |
| 8 | 3213 |
| 9 | 9259 |
| 10 | 26430 |
| 11 | 74806 |
| 12 | 210095 |
| 13 | 585890 |
| 14 | 1623240 |
| 15 | 4470232 |
| 16 | 12241799 |
| 17 | 33349751 |
| 18 | 90410255 |
| 19 | 243977941 |
| 20 | 655553258 |
| 21 | 1754265279 |
| 22 | 4676358086 |
| 23 | 12420299846 |
| 24 | 32873598566 |
| 25 | 86721264126 |
| 26 | 228051843891 |
| 27 | 597905347237 |
| 28 | 1563071037798 |
| 29 | 4074973824099 |
[1,1,4,13,41,125,374,1103,3213,9259,26430,74806, 210095,585890,1623240,4470232,12241799,33349751, 90410255,243977941,655553258,1754265279, 4676358086,12420299846,32873598566,86721264126, 228051843891,597905347237,1563071037798, 4074973824099] |