The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 20 |
| 3 | 349 |
| 4 | 474 |
| 5 | 3999 |
| 6 | 4624 |
| 7 | 5000 |
| 8 | 35624 |
| 9 | 390624 |
| 10 | 499999 |
| 11 | 1609375 |
| 12 | 27109375 |
| 13 | 40000000 |
| 14 | 137109375 |
| 15 | 149999999 |
| 16 | 3000000000 |
| 17 | 4787109375 |
| 18 | 6787109375 |
| 19 | 24999999999 |
| 20 | 200000000000 |
| 21 | 281787109375 |
| 22 | 1581787109375 |
| 23 | 3499999999999 |
[4,20,349,474,3999,4624,5000,35624,390624,499999, 1609375,27109375,40000000,137109375,149999999, 3000000000,4787109375,6787109375,24999999999, 200000000000,281787109375,1581787109375, 3499999999999] |