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 | 12 |
| 3 | 124 |
| 4 | 588 |
| 5 | 2319 |
| 6 | 11094 |
| 7 | 52882 |
| 8 | 255900 |
| 9 | 1213693 |
| 10 | 5681867 |
| 11 | 26951995 |
| 12 | 128276070 |
| 13 | 607245760 |
| 14 | 2873887210 |
| 15 | 13621766889 |
| 16 | 64560977404 |
| 17 | 305887320978 |
| 18 | 1449284744409 |
| 19 | 6867120322984 |
| 20 | 32538956230983 |
| 21 | 154179092000785 |
| 22 | 730537134063463 |
| 23 | 3461478405209108 |
| 24 | 16401475071020550 |