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 | 10 |
| 4 | 25 |
| 5 | 59 |
| 6 | 146 |
| 7 | 344 |
| 8 | 851 |
| 9 | 2005 |
| 10 | 4960 |
| 11 | 11686 |
| 12 | 28909 |
| 13 | 68111 |
| 14 | 168494 |
| 15 | 396980 |
| 16 | 982055 |
| 17 | 2313769 |
| 18 | 5723836 |
| 19 | 13485634 |
| 20 | 33360961 |
| 21 | 78600035 |
| 22 | 194441930 |
| 23 | 458114576 |
| 24 | 1133290619 |
| 25 | 2670087421 |
| 26 | 6605301784 |
| 27 | 15562409950 |
| 28 | 38498520085 |
| 29 | 90704372279 |
| 30 | 224385818726 |