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 | 4 |
| 1 | 14 |
| 2 | 53 |
| 3 | 197 |
| 4 | 736 |
| 5 | 2746 |
| 6 | 10249 |
| 7 | 38249 |
| 8 | 142748 |
| 9 | 532742 |
| 10 | 1988221 |
| 11 | 7420141 |
| 12 | 27692344 |
| 13 | 103349234 |
| 14 | 385704593 |
| 15 | 1439469137 |
| 16 | 5372171956 |
| 17 | 20049218686 |
| 18 | 74824702789 |
| 19 | 279249592469 |
| 20 | 1042173667088 |
| 21 | 3889445075882 |
| 22 | 14515606636441 |
| 23 | 54172981469881 |
| 24 | 202176319243084 |