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 | 12 |
| 2 | 144 |
| 3 | 636 |
| 4 | 3560 |
| 5 | 18688 |
| 6 | 101036 |
| 7 | 541380 |
| 8 | 2906592 |
| 9 | 15585680 |
| 10 | 83611228 |
| 11 | 448508160 |
| 12 | 2406031628 |
| 13 | 12906861916 |
| 14 | 69237527840 |
| 15 | 371416568460 |
| 16 | 1992423747700 |
| 17 | 10688138114240 |
| 18 | 57335348257076 |
| 19 | 307569175706760 |
| 20 | 1649921069864080 |