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 | 5 |
| 3 | 41 |
| 4 | 189 |
| 5 | 674 |
| 6 | 2098 |
| 7 | 6050 |
| 8 | 16703 |
| 9 | 44995 |
| 10 | 119575 |
| 11 | 315460 |
| 12 | 829060 |
| 13 | 2174596 |
| 14 | 5698329 |
| 15 | 14924829 |
| 16 | 39081553 |
| 17 | 102326310 |
| 18 | 267905078 |
| 19 | 701397990 |
| 20 | 1836299475 |
| 21 | 4807512695 |
| 22 | 12586252715 |
| 23 | 32951261576 |
| 24 | 86267550344 |
| 25 | 225851410184 |
| 26 | 591286703533 |
| 27 | 1548008726545 |
| 28 | 4052739505253 |
| 29 | 10610209821610 |