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) |
|---|---|
| 2 | 67 |
| 3 | 348 |
| 4 | 1495 |
| 5 | 6108 |
| 6 | 24501 |
| 7 | 97456 |
| 8 | 385900 |
| 9 | 1524066 |
| 10 | 6009720 |
| 11 | 23675882 |
| 12 | 93226503 |
| 13 | 367005692 |
| 14 | 1444728537 |
| 15 | 5687662392 |
| 16 | 22395051912 |
| 17 | 88199397642 |
| 18 | 347448657492 |
| 19 | 1369107075762 |
| 20 | 5396498311992 |
| 21 | 21277355051610 |
| 22 | 83918011194996 |
| 23 | 331073286677058 |
| 24 | 1306540603377930 |
| 25 | 5157617675058838 |
| 26 | 20365730134359298 |
| 27 | 80440031466243942 |