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 | 5 |
| 2 | 20 |
| 3 | 65 |
| 4 | 190 |
| 5 | 502 |
| 6 | 1245 |
| 7 | 2910 |
| 8 | 6505 |
| 9 | 13965 |
| 10 | 29005 |
| 11 | 58455 |
| 12 | 114810 |
| 13 | 220240 |
| 14 | 413775 |
| 15 | 762635 |
| 16 | 1381550 |
| 17 | 2463060 |
| 18 | 4327445 |
| 19 | 7500260 |
| 20 | 12836645 |
| 21 | 21712470 |
| 22 | 36323930 |
| 23 | 60143320 |
| 24 | 98620425 |
| 25 | 160238035 |
| 26 | 258110955 |
| 27 | 412367705 |
| 28 | 653709340 |
| 29 | 1028658150 |
| 30 | 1607306688 |