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 | 20 |
| 2 | 290 |
| 3 | 2215 |
| 4 | 7405 |
| 5 | 21150 |
| 6 | 43490 |
| 7 | 88230 |
| 8 | 151135 |
| 9 | 250825 |
| 10 | 384360 |
| 11 | 578840 |
| 12 | 814180 |
| 13 | 1151525 |
| 14 | 1550530 |
| 15 | 2063225 |
| 16 | 2676925 |
| 17 | 3452460 |
| 18 | 4333340 |
| 19 | 5436210 |
| 20 | 6668320 |
| 21 | 8154980 |
| 22 | 9837690 |
| 23 | 11822175 |
| 24 | 13993360 |
| 25 | 16569650 |
| 26 | 19401865 |
| 27 | 22636495 |
| 28 | 26182350 |
| 29 | 30253225 |
| 30 | 34608450 |
| 31 | 39628050 |