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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 | 3 |
| 2 | 12 |
| 3 | 30 |
| 4 | 93 |
| 5 | 246 |
| 6 | 768 |
| 7 | 2190 |
| 8 | 6654 |
| 9 | 19713 |
| 10 | 59304 |
| 11 | 177150 |
| 12 | 532290 |
| 13 | 1594326 |
| 14 | 4785168 |
| 15 | 14349180 |
| 16 | 43053375 |
| 17 | 129140166 |
| 18 | 387440940 |
| 19 | 1162261470 |
| 20 | 3486843786 |
| 21 | 10460355420 |
| 22 | 31381236768 |
| 23 | 94143178830 |
| 24 | 282430075332 |
| 25 | 847288609689 |
| 26 | 2541867422664 |
| 27 | 7625597504700 |
| 28 | 22876797240210 |
[1,3,12,30,93,246,768,2190,6654,19713,59304, 177150,532290,1594326,4785168,14349180,43053375, 129140166,387440940,1162261470,3486843786, 10460355420,31381236768,94143178830,282430075332, 847288609689,2541867422664,7625597504700, 22876797240210] |