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 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 59 |
| 5 | 151 |
| 6 | 916 |
| 7 | 1961 |
| 8 | 12035 |
| 9 | 35110 |
| 10 | 166204 |
| 11 | 384781 |
| 12 | 3154367 |
| 13 | 5600323 |
| 14 | 34384676 |
| 15 | 124093963 |
| 16 | 582290595 |
| 17 | 1235438587 |
| 18 | 9831378712 |
| 19 | 18602770421 |
| 20 | 144738772109 |
| 21 | 410101237013 |
| 22 | 1721535323380 |
| 23 | 4295702988313 |
| 24 | 40309503022439 |