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 | 65 |
| 3 | 1361 |
| 4 | 15761 |
| 5 | 124661 |
| 6 | 751925 |
| 7 | 3696581 |
| 8 | 15475205 |
| 9 | 56884430 |
| 10 | 187758030 |
| 11 | 565982734 |
| 12 | 1578749710 |
| 13 | 4117700254 |
| 14 | 10127050654 |
| 15 | 23648089054 |
| 16 | 52733344990 |
| 17 | 112835299639 |
| 18 | 232623278455 |
| 19 | 463695768455 |
| 20 | 896396608455 |
| 21 | 1684993889355 |
| 22 | 3086944610955 |
| 23 | 5522978819355 |