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 | 15 |
| 2 | 225 |
| 3 | 611 |
| 4 | 2163 |
| 5 | 8575 |
| 6 | 27931 |
| 7 | 88243 |
| 8 | 288813 |
| 9 | 926949 |
| 10 | 2927115 |
| 11 | 9278885 |
| 12 | 29390445 |
| 13 | 92717065 |
| 14 | 292337359 |
| 15 | 921806095 |
| 16 | 2904391209 |
| 17 | 9147369231 |
| 18 | 28808166663 |
| 19 | 90713456051 |
| 20 | 285607327515 |
| 21 | 899181685831 |
| 22 | 2830809676285 |
| 23 | 8911643119525 |