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 | 1 |
| 2 | 31 |
| 3 | 241 |
| 4 | 991 |
| 5 | 3091 |
| 6 | 7501 |
| 7 | 16531 |
| 8 | 31711 |
| 9 | 57781 |
| 10 | 96601 |
| 11 | 157651 |
| 12 | 240031 |
| 13 | 362491 |
| 14 | 519961 |
| 15 | 739201 |
| 16 | 1012441 |
| 17 | 1383721 |
| 18 | 1822711 |
| 19 | 2409241 |
| 20 | 3091441 |
| 21 | 3966301 |
| 22 | 4974751 |
| 23 | 6257461 |
| 24 | 7680781 |
| 25 | 9481681 |
| 26 | 11474941 |
| 27 | 13916191 |
| 28 | 16610371 |
| 29 | 19911151 |
| 30 | 23435191 |