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 | 23 |
| 3 | 221 |
| 4 | 1355 |
| 5 | 6239 |
| 6 | 23465 |
| 7 | 75803 |
| 8 | 217373 |
| 9 | 566150 |
| 10 | 1361802 |
| 11 | 3063502 |
| 12 | 6508450 |
| 13 | 13159666 |
| 14 | 25481470 |
| 15 | 47493274 |
| 16 | 85567222 |
| 17 | 149553199 |
| 18 | 254336185 |
| 19 | 421956275 |
| 20 | 684451365 |
| 21 | 1087616985 |
| 22 | 1695917535 |
| 23 | 2598828765 |
| 24 | 3918943275 |
| 25 | 5822229660 |
| 26 | 8530902276 |
| 27 | 12339433068 |