The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3159 |
| 2 | 4517 |
| 3 | 6880 |
| 4 | 11766 |
| 5 | 28668 |
| 6 | 80058 |
| 7 | 253176 |
| 8 | 1011114 |
| 9 | 4109928 |
| 10 | 16573530 |
| 11 | 76394256 |
| 12 | 343071594 |
| 13 | 1473267984 |
| 14 | 7095859362 |
| 15 | 32986799520 |
| 16 | 145080603426 |
| 17 | 712092090408 |
| 18 | 3363516907218 |
| 19 | 14962452326376 |
| 20 | 74120256227754 |
[3159,4517,6880,11766,28668,80058,253176,1011114, 4109928,16573530,76394256,343071594,1473267984, 7095859362,32986799520,145080603426,712092090408, 3363516907218,14962452326376,74120256227754] |