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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 24 |
| 6 | 103 |
| 7 | 436 |
| 8 | 1847 |
| 9 | 9671 |
| 10 | 59873 |
| 11 | 428782 |
| 12 | 3061347 |
| 13 | 24919558 |
| 14 | 202417811 |
| 15 | 1644262046 |
| 16 | 13356514179 |
| 17 | 121852889657 |
| 18 | 1231885410749 |
| 19 | 13672592407896 |
| 20 | 165302994305501 |
| 21 | 1997308524073908 |
| 22 | 26130313807266305 |
| 23 | 367821701825802178 |