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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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 31 |
| 7 | 74 |
| 8 | 180 |
| 9 | 598 |
| 10 | 1834 |
| 11 | 4788 |
| 12 | 14996 |
| 13 | 49482 |
| 14 | 143789 |
| 15 | 435354 |
| 16 | 1453804 |
| 17 | 4561596 |
| 18 | 13938918 |
| 19 | 45872900 |
| 20 | 150436644 |
| 21 | 473005586 |
| 22 | 1538113866 |
| 23 | 5131580610 |
| 24 | 16631971200 |
| 25 | 54060256628 |
| 26 | 180817311524 |
| 27 | 599398780812 |
| 28 | 1965766211768 |
| 29 | 6566285301920 |
| 30 | 22047832597671 |
| 31 | 73217323048944 |
| 32 | 244741654013110 |
[1,0,1,2,4,8,31,74,180,598,1834,4788,14996,49482, 143789,435354,1453804,4561596,13938918,45872900, 150436644,473005586,1538113866,5131580610, 16631971200,54060256628,180817311524,599398780812, 1965766211768,6566285301920,22047832597671, 73217323048944,244741654013110] |