The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 11 |
| 2 | 71 |
| 3 | 331 |
| 4 | 1621 |
| 5 | 2861 |
| 6 | 4271 |
| 7 | 10891 |
| 8 | 38011 |
| 9 | 57331 |
| 10 | 137491 |
| 11 | 349471 |
| 12 | 693061 |
| 13 | 869551 |
| 14 | 1118441 |
| 15 | 1409851 |
| 16 | 3826001 |
| 17 | 5376551 |
| 18 | 7929491 |
| 19 | 11066921 |
| 20 | 13167251 |
| 21 | 13943351 |
| 22 | 18719791 |
| 23 | 31857151 |
| 24 | 51443891 |
| 25 | 68447201 |
| 26 | 104383781 |
| 27 | 149054291 |
| 28 | 180666691 |
[11,71,331,1621,2861,4271,10891,38011,57331, 137491,349471,693061,869551,1118441,1409851, 3826001,5376551,7929491,11066921,13167251, 13943351,18719791,31857151,51443891,68447201, 104383781,149054291,180666691] |