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 | 1 |
| 1 | 5 |
| 2 | 26 |
| 3 | 141 |
| 4 | 799 |
| 5 | 4736 |
| 6 | 29371 |
| 7 | 190497 |
| 8 | 1291020 |
| 9 | 9131275 |
| 10 | 67310847 |
| 11 | 516369838 |
| 12 | 4116416797 |
| 13 | 34051164985 |
| 14 | 291871399682 |
| 15 | 2588914083065 |
| 16 | 23733360653955 |
| 17 | 224592570163192 |
| 18 | 2191466128865567 |
| 19 | 22024934452712437 |
| 20 | 227771488390279260 |