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 | 4 |
| 2 | 4 |
| 3 | 11 |
| 4 | 45 |
| 5 | 70 |
| 6 | 1111 |
| 7 | 4423 |
| 8 | 5478 |
| 9 | 49340 |
| 10 | 94388 |
| 11 | 200677 |
| 12 | 308749 |
| 13 | 708066 |
| 14 | 711391 |
| 15 | 1113024 |
| 16 | 4342375 |
| 17 | 4529119 |
| 18 | 8061070 |
| 19 | 12060867 |
| 20 | 56215509 |
| 21 | 69737317 |
| 22 | 124001030 |
| 23 | 214920537 |
| 24 | 471564389 |
| 25 | 891380746 |
| 26 | 4293367334 |
| 27 | 5031151602 |
| 28 | 9832878719 |
| 29 | 15034446439 |
| 30 | 15481444638 |