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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 | 2 |
| 3 | 2 |
| 4 | 10 |
| 5 | 22 |
| 6 | 70 |
| 7 | 186 |
| 8 | 538 |
| 9 | 1494 |
| 10 | 4230 |
| 11 | 11866 |
| 12 | 33434 |
| 13 | 94006 |
| 14 | 264582 |
| 15 | 744314 |
| 16 | 2094362 |
| 17 | 5892502 |
| 18 | 16579462 |
| 19 | 46647706 |
| 20 | 131248794 |
| 21 | 369281782 |
| 22 | 1039014534 |
| 23 | 2923376826 |
| 24 | 8225233690 |
| 25 | 23142568790 |
| 26 | 65114084998 |
| 27 | 183205408986 |
| 28 | 515467935386 |
[0,2,2,10,22,70,186,538,1494,4230,11866,33434, 94006,264582,744314,2094362,5892502,16579462, 46647706,131248794,369281782,1039014534, 2923376826,8225233690,23142568790,65114084998, 183205408986,515467935386] |