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 | 10 |
| 2 | 55 |
| 3 | 220 |
| 4 | 715 |
| 5 | 2002 |
| 6 | 5005 |
| 7 | 11440 |
| 8 | 24310 |
| 9 | 48620 |
| 10 | 92377 |
| 11 | 167950 |
| 12 | 293875 |
| 13 | 497200 |
| 14 | 816475 |
| 15 | 1305502 |
| 16 | 2037970 |
| 17 | 3113110 |
| 18 | 4662515 |
| 19 | 6858280 |
| 20 | 9922627 |
| 21 | 14139190 |
| 22 | 19866145 |
| 23 | 27551380 |
| 24 | 37749910 |
| 25 | 51143752 |
| 26 | 68564485 |
| 27 | 91018730 |
| 28 | 119716795 |
| 29 | 156104740 |
| 30 | 201900127 |