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 | 9 |
| 1 | 59 |
| 2 | 258 |
| 3 | 1621 |
| 4 | 41718 |
| 5 | 163096 |
| 6 | 18032586 |
| 7 | 372522402 |
| 8 | 4134015746 |
| 9 | 32288273026 |
| 10 | 351014976193 |
| 11 | 4870192684354 |
| 12 | 16888414224772 |
| 13 | 69504582263701 |
| 14 | 605288885084501 |
| 15 | 142251062156316087 |
| 16 | 465610991052284457 |
| 17 | 1483900314571047497 |
| 18 | 5622121203907195494 |
| 19 | 23213137436116662167 |