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 | 1 |
| 2 | 10 |
| 3 | 30 |
| 4 | 117 |
| 5 | 345 |
| 6 | 1042 |
| 7 | 2746 |
| 8 | 7063 |
| 9 | 16759 |
| 10 | 38440 |
| 11 | 83476 |
| 12 | 175473 |
| 13 | 354105 |
| 14 | 694278 |
| 15 | 1318222 |
| 16 | 2440888 |
| 17 | 4402852 |
| 18 | 7770908 |
| 19 | 13418156 |
| 20 | 22734824 |
| 21 | 37807500 |
| 22 | 61839510 |
| 23 | 99526422 |
| 24 | 157858478 |
| 25 | 246864782 |
| 26 | 381087734 |
| 27 | 580990046 |
| 28 | 875572808 |
| 29 | 1304930876 |
| 30 | 1924761300 |
| 31 | 2810843268 |