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 | 3 |
| 3 | 10 |
| 4 | 43 |
| 5 | 221 |
| 6 | 1371 |
| 7 | 9696 |
| 8 | 78751 |
| 9 | 712447 |
| 10 | 7173853 |
| 11 | 79106413 |
| 12 | 952587175 |
| 13 | 12397677007 |
| 14 | 173864946685 |
| 15 | 2609479384942 |
| 16 | 41786786069887 |
| 17 | 710577455524223 |
| 18 | 12795789975272877 |
| 19 | 243154034699436147 |
| 20 | 4864103085730989101 |
| 21 | 102153340062463300261 |
| 22 | 2247608818115460466681 |