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 | 3 |
| 3 | 8 |
| 4 | 28 |
| 5 | 110 |
| 6 | 519 |
| 7 | 2749 |
| 8 | 16317 |
| 9 | 106425 |
| 10 | 755425 |
| 11 | 5781956 |
| 12 | 47384170 |
| 13 | 413331955 |
| 14 | 3818838624 |
| 15 | 37213866876 |
| 16 | 381108145231 |
| 17 | 4088785729738 |
| 18 | 45829237977692 |
| 19 | 535340785268513 |
| 20 | 6502943193997922 |
| 21 | 81984445333355812 |
| 22 | 1070848034863526547 |
| 23 | 14467833457108560375 |
| 24 | 201894571410270034773 |