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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 19 |
| 5 | 80 |
| 6 | 416 |
| 7 | 2306 |
| 8 | 14588 |
| 9 | 98053 |
| 10 | 724183 |
| 11 | 5633793 |
| 12 | 47416901 |
| 13 | 417050215 |
| 14 | 3914152702 |
| 15 | 38288228393 |
| 16 | 395496623939 |
| 17 | 4241350801439 |
| 18 | 47715403637219 |
| 19 | 555476398869869 |
| 20 | 6744406721447538 |
| 21 | 84548532634924758 |
| 22 | 1100301545470162305 |
| 23 | 14751287346427752887 |