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 | 3 |
| 2 | 2 |
| 3 | 12 |
| 4 | 24 |
| 5 | 70 |
| 6 | 192 |
| 7 | 633 |
| 8 | 2484 |
| 9 | 10554 |
| 10 | 35054 |
| 11 | 102520 |
| 12 | 337948 |
| 13 | 1366804 |
| 14 | 6000028 |
| 15 | 24951622 |
| 16 | 94266262 |
| 17 | 337342046 |
| 18 | 1263530794 |
| 19 | 5269371063 |
| 20 | 23209051416 |
| 21 | 98571237345 |
| 22 | 383041820280 |
| 23 | 1353435250769 |
| 24 | 4542413798878 |
| 25 | 16490190511798 |
| 26 | 76615460665948 |
| 27 | 434914649543770 |