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 | 13 |
| 2 | 50 |
| 3 | 185 |
| 4 | 686 |
| 5 | 2562 |
| 6 | 9636 |
| 7 | 36465 |
| 8 | 138710 |
| 9 | 529958 |
| 10 | 2032316 |
| 11 | 7818538 |
| 12 | 30161740 |
| 13 | 116635300 |
| 14 | 451980360 |
| 15 | 1754766945 |
| 16 | 6824030310 |
| 17 | 26577181950 |
| 18 | 103647597900 |
| 19 | 404703270510 |
| 20 | 1581953021220 |
| 21 | 6189965556060 |
| 22 | 24242879364600 |
| 23 | 95027512981050 |
| 24 | 372782298576636 |
| 25 | 1463445866837052 |