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) |
|---|---|
| 0 | 1 |
| 1 | 25 |
| 2 | 73 |
| 3 | 169 |
| 4 | 453 |
| 5 | 1205 |
| 6 | 3301 |
| 7 | 9125 |
| 8 | 25501 |
| 9 | 71773 |
| 10 | 203253 |
| 11 | 578405 |
| 12 | 1652793 |
| 13 | 4739305 |
| 14 | 13630417 |
| 15 | 39303329 |
| 16 | 113588941 |
| 17 | 328938125 |
| 18 | 954262789 |
| 19 | 2772787445 |
| 20 | 8068471393 |
| 21 | 23508942353 |
| 22 | 68578993897 |
| 23 | 200272341785 |
| 24 | 585441977665 |