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 | 2 |
| 2 | 9 |
| 3 | 31 |
| 4 | 109 |
| 5 | 338 |
| 6 | 1029 |
| 7 | 2889 |
| 8 | 7797 |
| 9 | 19928 |
| 10 | 48965 |
| 11 | 115275 |
| 12 | 262034 |
| 13 | 574803 |
| 14 | 1222170 |
| 15 | 2521350 |
| 16 | 5060938 |
| 17 | 9896451 |
| 18 | 18891871 |
| 19 | 35249977 |
| 20 | 64390786 |
| 21 | 115284416 |
| 22 | 202560300 |
| 23 | 349637130 |
| 24 | 593499173 |
| 25 | 991625986 |
| 26 | 1632248998 |
| 27 | 2648936320 |
| 28 | 4241607523 |
| 29 | 6705867270 |
| 30 | 10474314965 |