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 | 4 |
| 3 | 25 |
| 4 | 97 |
| 5 | 309 |
| 6 | 894 |
| 7 | 2462 |
| 8 | 6610 |
| 9 | 17519 |
| 10 | 46135 |
| 11 | 121115 |
| 12 | 317484 |
| 13 | 831660 |
| 14 | 2177872 |
| 15 | 5702389 |
| 16 | 14929789 |
| 17 | 39087537 |
| 18 | 102333450 |
| 19 | 267913514 |
| 20 | 701407870 |
| 21 | 1836310955 |
| 22 | 4807525939 |
| 23 | 12586267895 |
| 24 | 32951278872 |
| 25 | 86267569944 |
| 26 | 225851432284 |
| 27 | 591286728337 |
| 28 | 1548008754265 |