The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 27 |
| 1 | 28 |
| 2 | 139 |
| 3 | 1835 |
| 4 | 1974 |
| 5 | 5783 |
| 6 | 13540 |
| 7 | 19323 |
| 8 | 264739 |
| 9 | 1078279 |
| 10 | 1343018 |
| 11 | 73601251 |
| 12 | 74944269 |
| 13 | 373378327 |
| 14 | 4928862520 |
| 15 | 5302240847 |
| 16 | 15533344214 |
| 17 | 36368929275 |
| 18 | 51902273489 |
| 19 | 711098484632 |
| 20 | 2896296212017 |
| 21 | 3607394696649 |
| 22 | 197695609831063 |
| 23 | 201303004527712 |
[27,28,139,1835,1974,5783,13540,19323,264739, 1078279,1343018,73601251,74944269,373378327, 4928862520,5302240847,15533344214,36368929275, 51902273489,711098484632,2896296212017, 3607394696649,197695609831063,201303004527712] |