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 | 2 |
| 1 | 5 |
| 2 | 14 |
| 3 | 44 |
| 4 | 152 |
| 5 | 560 |
| 6 | 2144 |
| 7 | 8384 |
| 8 | 33152 |
| 9 | 131840 |
| 10 | 525824 |
| 11 | 2100224 |
| 12 | 8394752 |
| 13 | 33566720 |
| 14 | 134242304 |
| 15 | 536920064 |
| 16 | 2147581952 |
| 17 | 8590131200 |
| 18 | 34360131584 |
| 19 | 137439739904 |
| 20 | 549757386752 |
| 21 | 2199026401280 |
| 22 | 8796099313664 |
| 23 | 35184384671744 |
| 24 | 140737513521152 |
| 25 | 562950003752960 |
| 26 | 2251799914348544 |
| 27 | 9007199456067584 |