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 | 10 |
| 3 | 74 |
| 4 | 586 |
| 5 | 4682 |
| 6 | 37450 |
| 7 | 299594 |
| 8 | 2396746 |
| 9 | 19173962 |
| 10 | 153391690 |
| 11 | 1227133514 |
| 12 | 9817068106 |
| 13 | 78536544842 |
| 14 | 628292358730 |
| 15 | 5026338869834 |
| 16 | 40210710958666 |
| 17 | 321685687669322 |
| 18 | 2573485501354570 |
| 19 | 20587884010836554 |
| 20 | 164703072086692426 |
| 21 | 1317624576693539402 |
| 22 | 10540996613548315210 |