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) |
|---|---|
| 1 | 4 |
| 2 | 21 |
| 3 | 75 |
| 4 | 189 |
| 5 | 495 |
| 6 | 897 |
| 7 | 1683 |
| 8 | 2565 |
| 9 | 4071 |
| 10 | 6641 |
| 11 | 8959 |
| 12 | 13209 |
| 13 | 17835 |
| 14 | 22317 |
| 15 | 28623 |
| 16 | 37577 |
| 17 | 48439 |
| 18 | 57401 |
| 19 | 71623 |
| 20 | 85697 |
| 21 | 98623 |
| 22 | 118737 |
| 23 | 138195 |
| 24 | 163493 |
| 25 | 196231 |
| 26 | 224321 |
| 27 | 249775 |
| 28 | 281945 |
| 29 | 310759 |
| 30 | 347249 |
| 31 | 420751 |
| 32 | 467801 |
| 33 | 525943 |
| 34 | 571985 |
| 35 | 656047 |