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 | 36 |
| 3 | 231 |
| 4 | 1073 |
| 5 | 6838 |
| 6 | 45036 |
| 7 | 268655 |
| 8 | 1617465 |
| 9 | 9996907 |
| 10 | 61298132 |
| 11 | 373667037 |
| 12 | 2285559013 |
| 13 | 13993745417 |
| 14 | 85580111107 |
| 15 | 523343997645 |
| 16 | 3201466965125 |
| 17 | 19583433034979 |
| 18 | 119781882351653 |
| 19 | 732667670413245 |
| 20 | 4481577327382246 |