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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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 16 |
| 6 | 46 |
| 7 | 203 |
| 8 | 1178 |
| 9 | 7242 |
| 10 | 43786 |
| 11 | 259634 |
| 12 | 1540540 |
| 13 | 9414639 |
| 14 | 61061613 |
| 15 | 428890726 |
| 16 | 3266930298 |
| 17 | 26581123093 |
| 18 | 226393705465 |
| 19 | 1986997358251 |
| 20 | 17827284972818 |
| 21 | 163278469610570 |
| 22 | 1531115974317975 |
| 23 | 14771302315885372 |
| 24 | 147267150734530892 |
| 25 | 1521022490460243316 |
[0,0,1,3,7,16,46,203,1178,7242,43786,259634, 1540540,9414639,61061613,428890726,3266930298, 26581123093,226393705465,1986997358251, 17827284972818,163278469610570,1531115974317975, 14771302315885372,147267150734530892, 1521022490460243316] |