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 | 2 |
| 1 | 17 |
| 2 | 145 |
| 3 | 1241 |
| 4 | 10657 |
| 5 | 91817 |
| 6 | 793585 |
| 7 | 6880121 |
| 8 | 59823937 |
| 9 | 521638217 |
| 10 | 4560526225 |
| 11 | 39970994201 |
| 12 | 351149013217 |
| 13 | 3091621642217 |
| 14 | 27274838966065 |
| 15 | 241075504183481 |
| 16 | 2134495165562497 |
| 17 | 18928981513351817 |
| 18 | 168109033806481105 |