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 | 65 |
| 2 | 257 |
| 3 | 833 |
| 4 | 2561 |
| 5 | 7745 |
| 6 | 23297 |
| 7 | 69953 |
| 8 | 209921 |
| 9 | 629825 |
| 10 | 1889537 |
| 11 | 5668673 |
| 12 | 17006081 |
| 13 | 51018305 |
| 14 | 153054977 |
| 15 | 459164993 |
| 16 | 1377495041 |
| 17 | 4132485185 |
| 18 | 12397455617 |
| 19 | 37192366913 |
| 20 | 111577100801 |
| 21 | 334731302465 |
| 22 | 1004193907457 |
| 23 | 3012581722433 |
| 24 | 9037745167361 |
| 25 | 27113235502145 |