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 | 5 |
| 2 | 36 |
| 3 | 281 |
| 4 | 2245 |
| 5 | 18061 |
| 6 | 145601 |
| 7 | 1174500 |
| 8 | 9475901 |
| 9 | 76455961 |
| 10 | 616891945 |
| 11 | 4977472781 |
| 12 | 40161441636 |
| 13 | 324048393905 |
| 14 | 2614631600701 |
| 15 | 21096536145301 |
| 16 | 170220478472105 |
| 17 | 1373448758774436 |
| 18 | 11081871650713781 |
| 19 | 89415697915538545 |
| 20 | 721463601671126161 |
| 21 | 5821234309893001301 |
| 22 | 46969478172465070500 |
| 23 | 378980086070257592201 |
| 24 | 3057856106268358639861 |