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 | 2 |
| 2 | 6 |
| 3 | 13 |
| 4 | 21 |
| 5 | 24 |
| 6 | 225 |
| 7 | 615 |
| 8 | 17450 |
| 9 | 23228 |
| 10 | 57774 |
| 11 | 221361 |
| 12 | 522377 |
| 13 | 793040 |
| 14 | 1706305 |
| 15 | 8664354 |
| 16 | 19037086 |
| 17 | 51965160 |
| 18 | 56870701 |
| 19 | 124645388 |
| 20 | 784244500 |
| 21 | 792809072 |
| 22 | 3675221276 |
| 23 | 42108268014 |
| 24 | 53633289500 |
| 25 | 56827261536 |
| 26 | 67080647365 |