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 | 21 |
| 3 | 63 |
| 4 | 270 |
| 5 | 291 |
| 6 | 1065 |
| 7 | 2991 |
| 8 | 6102 |
| 9 | 10087 |
| 10 | 10279 |
| 11 | 10654 |
| 12 | 16528 |
| 13 | 144069 |
| 14 | 1440069 |
| 15 | 10253179 |
| 16 | 10657654 |
| 17 | 14400069 |
| 18 | 16163608 |
| 19 | 46676013 |
| 20 | 69460293 |
| 21 | 2346534651 |
| 22 | 2369436474 |
| 23 | 6313047393 |
| 24 | 10270341004 |
| 25 | 10657657654 |
| 26 | 14406534069 |
| 27 | 23400000651 |