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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 12 |
| 4 | 139 |
| 5 | 1222 |
| 6 | 9151 |
| 7 | 63138 |
| 8 | 412070 |
| 9 | 2585022 |
| 10 | 15739317 |
| 11 | 93614462 |
| 12 | 546390377 |
| 13 | 3139809956 |
| 14 | 17808523566 |
| 15 | 99888570784 |
| 16 | 554920263375 |
| 17 | 3057078206870 |
| 18 | 16717853840323 |
| 19 | 90826885281558 |
| 20 | 490581957118358 |
| 21 | 2635899256765106 |
[0,0,12,139,1222,9151,63138,412070,2585022, 15739317,93614462,546390377,3139809956, 17808523566,99888570784,554920263375, 3057078206870,16717853840323,90826885281558, 490581957118358,2635899256765106] |