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 | 0 |
| 3 | 29 |
| 4 | 661 |
| 5 | 6285 |
| 6 | 35378 |
| 7 | 143787 |
| 8 | 468529 |
| 9 | 1301351 |
| 10 | 3202970 |
| 11 | 7170593 |
| 12 | 14872997 |
| 13 | 28969129 |
| 14 | 53527866 |
| 15 | 94568255 |
| 16 | 160741233 |
| 17 | 264175507 |
| 18 | 421511954 |
| 19 | 655152581 |
| 20 | 994751765 |
| 21 | 1478979173 |
| 22 | 2157585442 |
| 23 | 3093803379 |
| 24 | 4367119121 |
| 25 | 6076449375 |
| 26 | 8343762538 |
| 27 | 11318183177 |