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 | 421 |
| 2 | 19834 |
| 3 | 321320 |
| 4 | 2837837 |
| 5 | 16970962 |
| 6 | 77357343 |
| 7 | 288712815 |
| 8 | 924335053 |
| 9 | 2621131557 |
| 10 | 6736000381 |
| 11 | 15956886023 |
| 12 | 35297721979 |
| 13 | 73650614324 |
| 14 | 146121877010 |
| 15 | 277441759058 |
| 16 | 506811766161 |
| 17 | 894639234101 |
| 18 | 1531707118508 |
| 19 | 2551438684546 |