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 | 1 |
| 2 | 14 |
| 3 | 62 |
| 4 | 276 |
| 5 | 1006 |
| 6 | 3610 |
| 7 | 12010 |
| 8 | 38984 |
| 9 | 122188 |
| 10 | 375122 |
| 11 | 1128446 |
| 12 | 3342794 |
| 13 | 9767588 |
| 14 | 28217820 |
| 15 | 80709424 |
| 16 | 228864620 |
| 17 | 644060262 |
| 18 | 1800346140 |
| 19 | 5002457832 |
| 20 | 13825549136 |
| 21 | 38026348240 |
| 22 | 104133664506 |
| 23 | 284037629690 |
| 24 | 771953153918 |
| 25 | 2091075938320 |
| 26 | 5647162827592 |
| 27 | 15208169217918 |