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 | 20 |
| 4 | 60 |
| 5 | 190 |
| 6 | 561 |
| 7 | 1651 |
| 8 | 4720 |
| 9 | 13300 |
| 10 | 36716 |
| 11 | 99872 |
| 12 | 267836 |
| 13 | 708890 |
| 14 | 1854255 |
| 15 | 4796273 |
| 16 | 12279445 |
| 17 | 31135188 |
| 18 | 78236006 |
| 19 | 194921680 |
| 20 | 481758832 |
| 21 | 1181675902 |
| 22 | 2877646681 |
| 23 | 6959866116 |
| 24 | 16723591530 |
| 25 | 39934902812 |
| 26 | 94795718409 |
| 27 | 223741936855 |
| 28 | 525206126933 |
| 29 | 1226393510220 |