The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 32 |
| 3 | 119 |
| 4 | 385 |
| 5 | 1127 |
| 6 | 3057 |
| 7 | 7799 |
| 8 | 18914 |
| 9 | 43950 |
| 10 | 98434 |
| 11 | 213486 |
| 12 | 450051 |
| 13 | 925013 |
| 14 | 1858355 |
| 15 | 3657052 |
| 16 | 7062245 |
| 17 | 13404195 |
| 18 | 25038741 |
| 19 | 46086250 |
| 20 | 83669927 |
| 21 | 149970936 |
| 22 | 265608168 |
| 23 | 465149039 |
| 24 | 806022315 |
| 25 | 1382822644 |
| 26 | 2350101516 |
| 27 | 3958427938 |
[1,7,32,119,385,1127,3057,7799,18914,43950,98434, 213486,450051,925013,1858355,3657052,7062245, 13404195,25038741,46086250,83669927,149970936, 265608168,465149039,806022315,1382822644, 2350101516,3958427938] |