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) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 129 |
| 3 | 646 |
| 4 | 2685 |
| 5 | 10002 |
| 6 | 34777 |
| 7 | 115566 |
| 8 | 372453 |
| 9 | 1175290 |
| 10 | 3654369 |
| 11 | 11245110 |
| 12 | 34349005 |
| 13 | 104373282 |
| 14 | 315969705 |
| 15 | 954002878 |
| 16 | 2874983541 |
| 17 | 8652474378 |
| 18 | 26015617585 |
| 19 | 78169534470 |
| 20 | 234766551261 |
| 21 | 704840716978 |
| 22 | 2115654610809 |
| 23 | 6349329417486 |
| 24 | 19052920751365 |
| 25 | 57169029907482 |