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 | 8 |
| 2 | 55 |
| 3 | 386 |
| 4 | 2701 |
| 5 | 18908 |
| 6 | 132355 |
| 7 | 926486 |
| 8 | 6485401 |
| 9 | 45397808 |
| 10 | 317784655 |
| 11 | 2224492586 |
| 12 | 15571448101 |
| 13 | 109000136708 |
| 14 | 763000956955 |
| 15 | 5341006698686 |
| 16 | 37387046890801 |
| 17 | 261709328235608 |
| 18 | 1831965297649255 |
| 19 | 12823757083544786 |