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 | 3 |
| 2 | 7 |
| 3 | 22 |
| 4 | 97 |
| 5 | 469 |
| 6 | 2339 |
| 7 | 12148 |
| 8 | 65295 |
| 9 | 358979 |
| 10 | 2006977 |
| 11 | 11380702 |
| 12 | 65311575 |
| 13 | 378574425 |
| 14 | 2213092750 |
| 15 | 13032826536 |
| 16 | 77244242937 |
| 17 | 460413902079 |
| 18 | 2758088752351 |
| 19 | 16596379614234 |
| 20 | 100269075879881 |
| 21 | 607996092039949 |
| 22 | 3698873710967989 |
| 23 | 22570809986322440 |