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 | 28 |
| 2 | 469 |
| 3 | 4614 |
| 4 | 36845 |
| 5 | 281271 |
| 6 | 2160036 |
| 7 | 16795265 |
| 8 | 131782267 |
| 9 | 1040869367 |
| 10 | 8260503068 |
| 11 | 65781844983 |
| 12 | 525128814213 |
| 13 | 4199218263977 |
| 14 | 33618978354499 |
| 15 | 269371779362318 |
| 16 | 2159531269883408 |
| 17 | 17319319103903054 |
| 18 | 138936031415524052 |