The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 15 |
| 4 | 217 |
| 5 | 449 |
| 6 | 2911 |
| 7 | 3360 |
| 8 | 197791 |
| 9 | 201151 |
| 10 | 1404697 |
| 11 | 3010545 |
| 12 | 43552327 |
| 13 | 90115199 |
| 14 | 584243521 |
| 15 | 674358720 |
| 16 | 39697049281 |
| 17 | 40371408001 |
| 18 | 281925497287 |
| 19 | 604222402575 |
| 20 | 8741039133337 |
| 21 | 18086300669249 |
| 22 | 117258843148831 |
| 23 | 135345143818080 |
| 24 | 7967277184597471 |
[1,1,7,15,217,449,2911,3360,197791,201151,1404697, 3010545,43552327,90115199,584243521,674358720, 39697049281,40371408001,281925497287,604222402575, 8741039133337,18086300669249,117258843148831, 135345143818080,7967277184597471] |