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 | 15 |
| 2 | 98 |
| 3 | 420 |
| 4 | 1386 |
| 5 | 3822 |
| 6 | 9240 |
| 7 | 20196 |
| 8 | 40755 |
| 9 | 77077 |
| 10 | 138138 |
| 11 | 236600 |
| 12 | 389844 |
| 13 | 621180 |
| 14 | 961248 |
| 15 | 1449624 |
| 16 | 2136645 |
| 17 | 3085467 |
| 18 | 4374370 |
| 19 | 6099324 |
| 20 | 8376830 |
| 21 | 11347050 |
| 22 | 15177240 |
| 23 | 20065500 |
| 24 | 26244855 |
| 25 | 33987681 |
| 26 | 43610490 |
| 27 | 55479088 |
| 28 | 70014120 |
| 29 | 87697016 |
| 30 | 109076352 |
| 31 | 134774640 |