This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 102 |
| 3 | 594 |
| 4 | 3258 |
| 5 | 17346 |
| 6 | 90450 |
| 7 | 464250 |
| 8 | 2353338 |
| 9 | 11809746 |
| 10 | 58773858 |
| 11 | 290465706 |
| 12 | 1426996746 |
| 13 | 6974700162 |
| 14 | 33938314674 |
| 15 | 164494914138 |
| 16 | 794524032090 |
| 17 | 3825755303730 |
| 18 | 18370501130754 |
| 19 | 87990608484618 |
| 20 | 420498562000554 |