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 | 128 |
| 1 | 2097152 |
| 2 | 105413504 |
| 3 | 1280000000 |
| 4 | 8031810176 |
| 5 | 34359738368 |
| 6 | 114415582592 |
| 7 | 319277809664 |
| 8 | 781250000000 |
| 9 | 1727094849536 |
| 10 | 3521614606208 |
| 11 | 6722988818432 |
| 12 | 12151280273024 |
| 13 | 20971520000000 |
| 14 | 34792782221696 |
| 15 | 55784660123648 |
| 16 | 86812553324672 |
| 17 | 131593177923584 |
| 18 | 194871710000000 |