The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 13 |
| 4 | 67 |
| 5 | 283 |
| 6 | 607 |
| 7 | 1093 |
| 8 | 12757 |
| 9 | 22963 |
| 10 | 49207 |
| 11 | 482233 |
| 12 | 1623847 |
| 13 | 797161 |
| 14 | 14614627 |
| 15 | 19929037 |
| 16 | 35872267 |
| 17 | 150663523 |
| 18 | 2044719247 |
| 19 | 1355971711 |
| 20 | 9879222469 |
| 21 | 37773497677 |
| 22 | 200490103057 |
| 23 | 172595827849 |
| 24 | 235357947067 |
| 25 | 1176789735337 |
| 26 | 5507375961379 |
| 27 | 10591107618037 |
[2,7,13,67,283,607,1093,12757,22963,49207,482233, 1623847,797161,14614627,19929037,35872267, 150663523,2044719247,1355971711,9879222469, 37773497677,200490103057,172595827849, 235357947067,1176789735337,5507375961379, 10591107618037] |