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 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 33 |
| 5 | 95 |
| 6 | 278 |
| 7 | 808 |
| 8 | 2355 |
| 9 | 6856 |
| 10 | 19969 |
| 11 | 58151 |
| 12 | 169353 |
| 13 | 493190 |
| 14 | 1436288 |
| 15 | 4182793 |
| 16 | 12181260 |
| 17 | 35474611 |
| 18 | 103310209 |
| 19 | 300862991 |
| 20 | 876181998 |
| 21 | 2551642760 |
| 22 | 7430968523 |
| 23 | 21640683328 |
| 24 | 63022629465 |
| 25 | 183536340391 |
| 26 | 534499885849 |
| 27 | 1556586163406 |
| 28 | 4533135643968 |
| 29 | 13201529892305 |
| 30 | 38445880553108 |
| 31 | 111963215139163 |
| 32 | 326062542045345 |