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) |
|---|---|
| 3 | 6 |
| 4 | 61 |
| 5 | 389 |
| 6 | 2066 |
| 7 | 9962 |
| 8 | 45594 |
| 9 | 202344 |
| 10 | 881859 |
| 11 | 3801171 |
| 12 | 16275292 |
| 13 | 69399116 |
| 14 | 295177196 |
| 15 | 1253532482 |
| 16 | 5318285553 |
| 17 | 22550198601 |
| 18 | 95580699774 |
| 19 | 405034367814 |
| 20 | 1716140731030 |
| 21 | 7270703692340 |
| 22 | 30801852323495 |
| 23 | 130485697292231 |
| 24 | 552764498063256 |
| 25 | 2341595675572344 |