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 | 1860 |
| 2 | 503502 |
| 3 | 47229864 |
| 4 | 2046701220 |
| 5 | 47775740520 |
| 6 | 671636175480 |
| 7 | 6309132101904 |
| 8 | 43733123309262 |
| 9 | 241275541236780 |
| 10 | 1111479953165352 |
| 11 | 4426891212365160 |
| 12 | 15633379938039144 |
| 13 | 49899492947343864 |
| 14 | 146147632445771200 |
| 15 | 397406328481552528 |
| 16 | 1013148957319630500 |
| 17 | 2440161908107807952 |