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) |
|---|---|
| 3 | 13 |
| 4 | 115 |
| 5 | 666 |
| 6 | 3234 |
| 7 | 14379 |
| 8 | 60981 |
| 9 | 251968 |
| 10 | 1026124 |
| 11 | 4145241 |
| 12 | 16670823 |
| 13 | 66879606 |
| 14 | 267944070 |
| 15 | 1072693399 |
| 16 | 4292739241 |
| 17 | 17175150780 |
| 18 | 68709515472 |
| 19 | 274856935653 |
| 20 | 1099467587835 |
| 21 | 4397954236690 |
| 22 | 17591993106730 |
| 23 | 70368341524803 |
| 24 | 281474137850205 |
| 25 | 1125898162012536 |