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 | 1 |
| 2 | 12 |
| 3 | 71 |
| 4 | 354 |
| 5 | 1617 |
| 6 | 7020 |
| 7 | 29563 |
| 8 | 122214 |
| 9 | 499493 |
| 10 | 2026848 |
| 11 | 8186895 |
| 12 | 32969754 |
| 13 | 132508729 |
| 14 | 531842196 |
| 15 | 2132610467 |
| 16 | 8545773774 |
| 17 | 34228238925 |
| 18 | 137046552264 |
| 19 | 548583066679 |
| 20 | 2195514451074 |
| 21 | 8785586531681 |
| 22 | 35152894560252 |
| 23 | 140643143849931 |
| 24 | 562667104454454 |
| 25 | 2250951652660597 |