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 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 53 |
| 5 | 176 |
| 6 | 677 |
| 7 | 2451 |
| 8 | 9333 |
| 9 | 34978 |
| 10 | 133580 |
| 11 | 508806 |
| 12 | 1953701 |
| 13 | 7509178 |
| 14 | 28981643 |
| 15 | 112046213 |
| 16 | 434289525 |
| 17 | 1686080622 |
| 18 | 6557830310 |
| 19 | 25542229740 |
| 20 | 99622788428 |
| 21 | 389023326600 |
| 22 | 1520817551742 |
| 23 | 5951305115982 |
| 24 | 23310374278437 |
| 25 | 91380414955176 |
| 26 | 358506409488102 |