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 | 11 |
| 2 | 71 |
| 3 | 351 |
| 4 | 1471 |
| 5 | 5503 |
| 6 | 18943 |
| 7 | 61183 |
| 8 | 187903 |
| 9 | 553983 |
| 10 | 1579007 |
| 11 | 4374527 |
| 12 | 11829247 |
| 13 | 31326207 |
| 14 | 81461247 |
| 15 | 208470015 |
| 16 | 525991935 |
| 17 | 1310457855 |
| 18 | 3228041215 |
| 19 | 7870611455 |
| 20 | 19012780031 |
| 21 | 45541752831 |
| 22 | 108246597631 |
| 23 | 255466668031 |
| 24 | 598980165631 |
| 25 | 1395931480063 |
| 26 | 3235049897983 |