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 | 1 |
| 2 | 23 |
| 3 | 486 |
| 4 | 10210 |
| 5 | 214415 |
| 6 | 4502721 |
| 7 | 94557148 |
| 8 | 1985700116 |
| 9 | 41699702445 |
| 10 | 875693751355 |
| 11 | 18389568778466 |
| 12 | 386180944347798 |
| 13 | 8109799831303771 |
| 14 | 170305796457379205 |
| 15 | 3576421725604963320 |
| 16 | 75104856237704229736 |
| 17 | 1577201980991788824473 |
| 18 | 33121241600827565313951 |
| 19 | 695546073617378871592990 |