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 | 7 |
| 2 | 49 |
| 3 | 211 |
| 4 | 883 |
| 5 | 3354 |
| 6 | 12529 |
| 7 | 45705 |
| 8 | 165506 |
| 9 | 595370 |
| 10 | 2135861 |
| 11 | 7647306 |
| 12 | 27355170 |
| 13 | 97794320 |
| 14 | 349507418 |
| 15 | 1248880596 |
| 16 | 4462146126 |
| 17 | 15941995134 |
| 18 | 56954562018 |
| 19 | 203473087470 |
| 20 | 726911218475 |
| 21 | 2596889588906 |
| 22 | 9277358418622 |
| 23 | 33143203071246 |