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 | 3 |
| 2 | 20 |
| 3 | 75 |
| 4 | 210 |
| 5 | 490 |
| 6 | 1008 |
| 7 | 1890 |
| 8 | 3300 |
| 9 | 5445 |
| 10 | 8580 |
| 11 | 13013 |
| 12 | 19110 |
| 13 | 27300 |
| 14 | 38080 |
| 15 | 52020 |
| 16 | 69768 |
| 17 | 92055 |
| 18 | 119700 |
| 19 | 153615 |
| 20 | 194810 |
| 21 | 244398 |
| 22 | 303600 |
| 23 | 373750 |
| 24 | 456300 |
| 25 | 552825 |
| 26 | 665028 |
| 27 | 794745 |
| 28 | 943950 |
| 29 | 1114760 |
| 30 | 1309440 |
| 31 | 1530408 |
| 32 | 1780240 |
| 33 | 2061675 |
| 34 | 2377620 |
| 35 | 2731155 |
| 36 | 3125538 |