The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 129 |
| 2 | 231 |
| 3 | 453 |
| 4 | 951 |
| 5 | 2109 |
| 6 | 4911 |
| 7 | 11973 |
| 8 | 30471 |
| 9 | 80589 |
| 10 | 220191 |
| 11 | 617493 |
| 12 | 1766391 |
| 13 | 5127069 |
| 14 | 15037071 |
| 15 | 44423013 |
| 16 | 131892711 |
| 17 | 392925549 |
| 18 | 1173271551 |
| 19 | 3508804533 |
| 20 | 10504393431 |
| 21 | 31469140029 |
| 22 | 94319339631 |
| 23 | 282781858053 |
| 24 | 847993252551 |
[129,231,453,951,2109,4911,11973,30471,80589, 220191,617493,1766391,5127069,15037071,44423013, 131892711,392925549,1173271551,3508804533, 10504393431,31469140029,94319339631,282781858053, 847993252551] |