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 | 8 |
| 3 | 35 |
| 4 | 107 |
| 5 | 421 |
| 6 | 1312 |
| 7 | 4474 |
| 8 | 13622 |
| 9 | 43977 |
| 10 | 130473 |
| 11 | 388025 |
| 12 | 1146640 |
| 13 | 3265446 |
| 14 | 9352424 |
| 15 | 26033637 |
| 16 | 72144351 |
| 17 | 196664848 |
| 18 | 532768901 |
| 19 | 1422725368 |
| 20 | 3768251677 |
| 21 | 9893857617 |
| 22 | 25709347054 |
| 23 | 66367179293 |
| 24 | 169754459790 |
| 25 | 431237516979 |
| 26 | 1086813719408 |
| 27 | 2722241654623 |