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 | 19 |
| 3 | 63 |
| 4 | 193 |
| 5 | 1005 |
| 6 | 4133 |
| 7 | 16029 |
| 8 | 68662 |
| 9 | 286079 |
| 10 | 1170324 |
| 11 | 4869491 |
| 12 | 20218182 |
| 13 | 83588667 |
| 14 | 346493199 |
| 15 | 1436419555 |
| 16 | 5949727953 |
| 17 | 24653341080 |
| 18 | 102162618558 |
| 19 | 423291469427 |
| 20 | 1753914307948 |
| 21 | 7267558737304 |
| 22 | 30113168208503 |
| 23 | 124774750283399 |