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 | 14 |
| 4 | 58 |
| 5 | 214 |
| 6 | 908 |
| 7 | 3442 |
| 8 | 14444 |
| 9 | 56386 |
| 10 | 234476 |
| 11 | 920490 |
| 12 | 3847998 |
| 13 | 15165982 |
| 14 | 62944212 |
| 15 | 250787568 |
| 16 | 1036586952 |
| 17 | 4132605038 |
| 18 | 17106500792 |
| 19 | 68303652958 |
| 20 | 281749732730 |
| 21 | 1130378730046 |
| 22 | 4648910236412 |
| 23 | 18657451711020 |
| 24 | 76808828008438 |