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 | 10 |
| 1 | 80 |
| 2 | 365 |
| 3 | 1246 |
| 4 | 3535 |
| 5 | 8800 |
| 6 | 19855 |
| 7 | 41470 |
| 8 | 81367 |
| 9 | 151580 |
| 10 | 270270 |
| 11 | 464100 |
| 12 | 771290 |
| 13 | 1245488 |
| 14 | 1960610 |
| 15 | 3016820 |
| 16 | 4547840 |
| 17 | 6729800 |
| 18 | 9791859 |
| 19 | 14028850 |
| 20 | 19816225 |
| 21 | 27627600 |
| 22 | 38055225 |
| 23 | 51833730 |
| 24 | 69867525 |
| 25 | 93262260 |
| 26 | 123360780 |
| 27 | 161784040 |
| 28 | 210477476 |
| 29 | 271763360 |