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 | 6 |
| 2 | 42 |
| 3 | 188 |
| 4 | 644 |
| 5 | 1826 |
| 6 | 4494 |
| 7 | 9912 |
| 8 | 20040 |
| 9 | 37758 |
| 10 | 67122 |
| 11 | 113652 |
| 12 | 184652 |
| 13 | 289562 |
| 14 | 440342 |
| 15 | 651888 |
| 16 | 942480 |
| 17 | 1334262 |
| 18 | 1853754 |
| 19 | 2532396 |
| 20 | 3407124 |
| 21 | 4520978 |
| 22 | 5923742 |
| 23 | 7672616 |
| 24 | 9832920 |
| 25 | 12478830 |
| 26 | 15694146 |
| 27 | 19573092 |
| 28 | 24221148 |
| 29 | 29755914 |
| 30 | 36308006 |