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 | 5 |
| 3 | 11 |
| 4 | 25 |
| 5 | 56 |
| 6 | 126 |
| 7 | 283 |
| 8 | 636 |
| 9 | 1429 |
| 10 | 3211 |
| 11 | 7215 |
| 12 | 16212 |
| 13 | 36428 |
| 14 | 81853 |
| 15 | 183922 |
| 16 | 413269 |
| 17 | 928607 |
| 18 | 2086561 |
| 19 | 4688460 |
| 20 | 10534874 |
| 21 | 23671647 |
| 22 | 53189708 |
| 23 | 119516189 |
| 24 | 268550439 |
| 25 | 603427359 |
| 26 | 1355888968 |
| 27 | 3046654856 |
| 28 | 6845771321 |
| 29 | 15382308530 |
| 30 | 34563733525 |
| 31 | 77664004259 |