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 | 4 |
| 3 | 6 |
| 4 | 16 |
| 5 | 30 |
| 6 | 64 |
| 7 | 165 |
| 8 | 361 |
| 9 | 875 |
| 10 | 2116 |
| 11 | 5460 |
| 12 | 13924 |
| 13 | 36720 |
| 14 | 97344 |
| 15 | 266895 |
| 16 | 727609 |
| 17 | 2029885 |
| 18 | 5654884 |
| 19 | 16014834 |
| 20 | 45265984 |
| 21 | 129279458 |
| 22 | 368947264 |
| 23 | 1060159545 |
| 24 | 3044280625 |
| 25 | 8779570735 |
| 26 | 25310900836 |
| 27 | 73171312896 |
| 28 | 211476737956 |
| 29 | 612259440564 |