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 | 4 |
| 3 | 14 |
| 4 | 40 |
| 5 | 105 |
| 6 | 252 |
| 7 | 574 |
| 8 | 1236 |
| 9 | 2564 |
| 10 | 5124 |
| 11 | 9948 |
| 12 | 18788 |
| 13 | 34685 |
| 14 | 62664 |
| 15 | 111132 |
| 16 | 193672 |
| 17 | 332325 |
| 18 | 561996 |
| 19 | 937958 |
| 20 | 1546132 |
| 21 | 2519825 |
| 22 | 4062888 |
| 23 | 6486008 |
| 24 | 10257324 |
| 25 | 16079389 |
| 26 | 24996636 |
| 27 | 38555216 |
| 28 | 59025820 |
| 29 | 89728900 |
| 30 | 135486960 |
| 31 | 203274344 |