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 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 29 |
| 6 | 94 |
| 7 | 304 |
| 8 | 1005 |
| 9 | 3336 |
| 10 | 11398 |
| 11 | 38739 |
| 12 | 132340 |
| 13 | 451086 |
| 14 | 1541074 |
| 15 | 5242767 |
| 16 | 17779666 |
| 17 | 60048847 |
| 18 | 202124143 |
| 19 | 677000711 |
| 20 | 2256910444 |
| 21 | 7486274436 |
| 22 | 24713275977 |
| 23 | 81162110629 |
| 24 | 265192045408 |
| 25 | 862061443031 |
| 26 | 2788194736946 |
| 27 | 8972104829849 |
| 28 | 28726271274133 |
| 29 | 91515498561954 |
| 30 | 290116750935925 |