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 | 3 |
| 1 | 7 |
| 2 | 19 |
| 3 | 63 |
| 4 | 235 |
| 5 | 919 |
| 6 | 3651 |
| 7 | 14575 |
| 8 | 58267 |
| 9 | 233031 |
| 10 | 932083 |
| 11 | 3728287 |
| 12 | 14913099 |
| 13 | 59652343 |
| 14 | 238609315 |
| 15 | 954437199 |
| 16 | 3817748731 |
| 17 | 15270994855 |
| 18 | 61083979347 |
| 19 | 244335917311 |
| 20 | 977343669163 |
| 21 | 3909374676567 |
| 22 | 15637498706179 |