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 | 126 |
| 2 | 8460 |
| 3 | 143028 |
| 4 | 1217196 |
| 5 | 6835050 |
| 6 | 29025832 |
| 7 | 100804408 |
| 8 | 300779112 |
| 9 | 797002582 |
| 10 | 1919734900 |
| 11 | 4275569868 |
| 12 | 8918598788 |
| 13 | 17597763122 |
| 14 | 33103533936 |
| 15 | 59741213696 |
| 16 | 103962922160 |
| 17 | 175195148094 |
| 18 | 286904314092 |
| 19 | 457948263108 |
| 20 | 714267962604 |