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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 | 6 |
| 3 | 18 |
| 4 | 56 |
| 5 | 178 |
| 6 | 580 |
| 7 | 1922 |
| 8 | 6466 |
| 9 | 22022 |
| 10 | 75788 |
| 11 | 263152 |
| 12 | 920768 |
| 13 | 3243414 |
| 14 | 11492460 |
| 15 | 40934616 |
| 16 | 146484296 |
| 17 | 526389182 |
| 18 | 1898722242 |
| 19 | 6872300848 |
| 20 | 24951521464 |
| 21 | 90851221740 |
| 22 | 331666951116 |
| 23 | 1213729811070 |
| 24 | 4451547793956 |
[1,2,6,18,56,178,580,1922,6466,22022,75788,263152, 920768,3243414,11492460,40934616,146484296, 526389182,1898722242,6872300848,24951521464, 90851221740,331666951116,1213729811070, 4451547793956] |