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 | 0 |
| 2 | 1 |
| 3 | 51 |
| 4 | 472 |
| 5 | 2963 |
| 6 | 10764 |
| 7 | 36538 |
| 8 | 95936 |
| 9 | 222561 |
| 10 | 502638 |
| 11 | 974245 |
| 12 | 1850784 |
| 13 | 3234269 |
| 14 | 5826680 |
| 15 | 8857926 |
| 16 | 15093248 |
| 17 | 21945012 |
| 18 | 35369541 |
| 19 | 48358119 |
| 20 | 74448464 |
| 21 | 98697648 |
| 22 | 148971972 |
| 23 | 187495262 |
| 24 | 276509952 |
| 25 | 336495665 |
| 26 | 488970662 |
| 27 | 590163894 |
| 28 | 823791168 |
| 29 | 966018241 |
| 30 | 1358404776 |