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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 | 3 |
| 4 | 1 |
| 5 | 9 |
| 6 | 19 |
| 7 | 18 |
| 8 | 91 |
| 9 | 165 |
| 10 | 271 |
| 11 | 990 |
| 12 | 1765 |
| 13 | 3843 |
| 14 | 11467 |
| 15 | 21630 |
| 16 | 53299 |
| 17 | 140724 |
| 18 | 287119 |
| 19 | 736101 |
| 20 | 1818235 |
| 21 | 3982044 |
| 22 | 10225117 |
| 23 | 24521409 |
| 24 | 56584243 |
| 25 | 143641017 |
| 26 | 341948179 |
| 27 | 816095982 |
| 28 | 2045559205 |
| 29 | 4888806237 |
| 30 | 11897144767 |
| 31 | 29540684052 |
[1,0,1,3,1,9,19,18,91,165,271,990,1765,3843,11467, 21630,53299,140724,287119,736101,1818235,3982044, 10225117,24521409,56584243,143641017,341948179, 816095982,2045559205,4888806237,11897144767, 29540684052] |