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 | 9 |
| 2 | 81 |
| 3 | 164 |
| 4 | 400 |
| 5 | 824 |
| 6 | 1940 |
| 7 | 4200 |
| 8 | 9276 |
| 9 | 21004 |
| 10 | 46026 |
| 11 | 102674 |
| 12 | 228630 |
| 13 | 506868 |
| 14 | 1128070 |
| 15 | 2505156 |
| 16 | 5569740 |
| 17 | 12380188 |
| 18 | 27502690 |
| 19 | 61145106 |
| 20 | 135886522 |
| 21 | 301975112 |
| 22 | 671190932 |
| 23 | 1491685306 |
| 24 | 3315241202 |
| 25 | 7368059728 |
| 26 | 16375432824 |
| 27 | 36394465410 |