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 | 50 |
| 3 | 224 |
| 4 | 1058 |
| 5 | 5054 |
| 6 | 24200 |
| 7 | 115934 |
| 8 | 555458 |
| 9 | 2661344 |
| 10 | 12751250 |
| 11 | 61094894 |
| 12 | 292723208 |
| 13 | 1402521134 |
| 14 | 6719882450 |
| 15 | 32196891104 |
| 16 | 154264573058 |
| 17 | 739125974174 |
| 18 | 3541365297800 |
| 19 | 16967700514814 |
| 20 | 81297137276258 |
| 21 | 389517985866464 |
| 22 | 1866292792056050 |
| 23 | 8941945974413774 |
| 24 | 42843437080012808 |
| 25 | 205275239425650254 |