The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 95 |
| 5 | 381 |
| 6 | 1625 |
| 7 | 6967 |
| 8 | 30701 |
| 9 | 136317 |
| 10 | 615734 |
| 11 | 2798025 |
| 12 | 12841240 |
| 13 | 59214378 |
| 14 | 274997325 |
| 15 | 1282425641 |
| 16 | 6010338554 |
| 17 | 28260119591 |
| 18 | 133377022363 |
| 19 | 631253981051 |
| 20 | 2996520123835 |
| 21 | 14257151419520 |
| 22 | 67994243210892 |
| 23 | 324913086812114 |
| 24 | 1555667890089721 |
| 25 | 7461052258003051 |
| 26 | 35842289376800873 |
| 27 | 172433728297469902 |
[1,2,7,24,95,381,1625,6967,30701,136317,615734, 2798025,12841240,59214378,274997325,1282425641, 6010338554,28260119591,133377022363,631253981051, 2996520123835,14257151419520,67994243210892, 324913086812114,1555667890089721,7461052258003051, 35842289376800873,172433728297469902] |