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 | 1 |
| 2 | 34 |
| 3 | 277 |
| 4 | 3049 |
| 5 | 31497 |
| 6 | 329350 |
| 7 | 3435392 |
| 8 | 35863972 |
| 9 | 374285478 |
| 10 | 3906605183 |
| 11 | 40773605243 |
| 12 | 425562898029 |
| 13 | 4441677458152 |
| 14 | 46358636450427 |
| 15 | 483853831650209 |
| 16 | 5050074056261222 |
| 17 | 52708577944998395 |
| 18 | 550129399697072615 |
| 19 | 5741804607960538038 |
| 20 | 59928300863912394900 |