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 | 3 |
| 3 | 6 |
| 4 | 14 |
| 5 | 31 |
| 6 | 72 |
| 7 | 166 |
| 8 | 390 |
| 9 | 922 |
| 10 | 2197 |
| 11 | 5273 |
| 12 | 12728 |
| 13 | 30892 |
| 14 | 75327 |
| 15 | 184476 |
| 16 | 453505 |
| 17 | 1118798 |
| 18 | 2768843 |
| 19 | 6872437 |
| 20 | 17103411 |
| 21 | 42670102 |
| 22 | 106697009 |
| 23 | 267359854 |
| 24 | 671260241 |
| 25 | 1688411587 |
| 26 | 4254084396 |
| 27 | 10735614274 |
| 28 | 27132998096 |
| 29 | 68671994940 |
| 30 | 174035109012 |
| 31 | 441607820562 |