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 | 5 |
| 3 | 15 |
| 4 | 45 |
| 5 | 110 |
| 6 | 271 |
| 7 | 599 |
| 8 | 1309 |
| 9 | 2690 |
| 10 | 5436 |
| 11 | 10545 |
| 12 | 20148 |
| 13 | 37341 |
| 14 | 68223 |
| 15 | 121878 |
| 16 | 214846 |
| 17 | 371993 |
| 18 | 636570 |
| 19 | 1073325 |
| 20 | 1790721 |
| 21 | 2950922 |
| 22 | 4816603 |
| 23 | 7778937 |
| 24 | 12455988 |
| 25 | 19761148 |
| 26 | 31108121 |
| 27 | 48572686 |
| 28 | 75307513 |
| 29 | 115909727 |
| 30 | 177255526 |
| 31 | 269294119 |
| 32 | 406708721 |
| 33 | 610593948 |