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 | 31 |
| 2 | 91 |
| 3 | 211 |
| 4 | 567 |
| 5 | 1511 |
| 6 | 4147 |
| 7 | 11483 |
| 8 | 32143 |
| 9 | 90607 |
| 10 | 256971 |
| 11 | 732323 |
| 12 | 2095527 |
| 13 | 6016951 |
| 14 | 17327779 |
| 15 | 50028971 |
| 16 | 144768703 |
| 17 | 419747711 |
| 18 | 1219179643 |
| 19 | 3546768563 |
| 20 | 10332747607 |
| 21 | 30141046727 |
| 22 | 88025807059 |
| 23 | 257351710523 |
| 24 | 753131995951 |