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 | -5 |
| 1 | 10159 |
| 2 | 867211 |
| 3 | 10373071 |
| 4 | 59271739 |
| 5 | 227860495 |
| 6 | 683245579 |
| 7 | 1727242351 |
| 8 | 3854919931 |
| 9 | 7823790319 |
| 10 | 14733641995 |
| 11 | 26117017999 |
| 12 | 44040338491 |
| 13 | 71215667791 |
| 14 | 111123125899 |
| 15 | 168143944495 |
| 16 | 247704167419 |
| 17 | 356428995631 |
| 18 | 502307776651 |
| 19 | 694869638479 |
| 20 | 945369767995 |