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 | 10 |
| 2 | 100 |
| 3 | 378 |
| 4 | 1970 |
| 5 | 9168 |
| 6 | 44538 |
| 7 | 212814 |
| 8 | 1022652 |
| 9 | 4904350 |
| 10 | 23540322 |
| 11 | 112961952 |
| 12 | 542115042 |
| 13 | 2601499810 |
| 14 | 12484112380 |
| 15 | 59908695042 |
| 16 | 287491745166 |
| 17 | 1379628582160 |
| 18 | 6620628961338 |
| 19 | 31771352156610 |
| 20 | 152465531316540 |
| 21 | 731656970494958 |