The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 364 |
| 3 | 3964 |
| 4 | 39964 |
| 5 | 399964 |
| 6 | 3999964 |
| 7 | 39999964 |
| 8 | 399999964 |
| 9 | 3999999964 |
| 10 | 39999999964 |
| 11 | 399999999964 |
| 12 | 3999999999964 |
| 13 | 39999999999964 |
| 14 | 399999999999964 |
| 15 | 3999999999999964 |
| 16 | 39999999999999964 |
| 17 | 399999999999999964 |
[4,364,3964,39964,399964,3999964,39999964, 399999964,3999999964,39999999964,399999999964, 3999999999964,39999999999964,399999999999964, 3999999999999964,39999999999999964, 399999999999999964] |