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 | 2 |
| 3 | 9 |
| 4 | 32 |
| 5 | 119 |
| 6 | 435 |
| 7 | 1573 |
| 8 | 5695 |
| 9 | 20773 |
| 10 | 76057 |
| 11 | 279850 |
| 12 | 1033937 |
| 13 | 3837070 |
| 14 | 14296494 |
| 15 | 53468768 |
| 16 | 200673056 |
| 17 | 755606952 |
| 18 | 2853697709 |
| 19 | 10807617884 |
| 20 | 41036410818 |
| 21 | 156186010430 |
| 22 | 595759180892 |
| 23 | 2277112205791 |
| 24 | 8720036044777 |
| 25 | 33451314673521 |
| 26 | 128533154571957 |