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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 | 2 |
| 2 | 12 |
| 3 | 74 |
| 4 | 480 |
| 5 | 3202 |
| 6 | 21756 |
| 7 | 149746 |
| 8 | 1040640 |
| 9 | 7285538 |
| 10 | 51307212 |
| 11 | 363057114 |
| 12 | 2579270304 |
| 13 | 18385404546 |
| 14 | 131429288828 |
| 15 | 941857237474 |
| 16 | 6764184258560 |
| 17 | 48671099313730 |
| 18 | 350799656912652 |
| 19 | 2532218940625642 |
| 20 | 18303373070813280 |
| 21 | 132462237913391362 |
| 22 | 959699439413581692 |
[1,2,12,74,480,3202,21756,149746,1040640,7285538, 51307212,363057114,2579270304,18385404546, 131429288828,941857237474,6764184258560, 48671099313730,350799656912652,2532218940625642, 18303373070813280,132462237913391362, 959699439413581692] |