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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 19 |
| 6 | 42 |
| 7 | 90 |
| 8 | 197 |
| 9 | 425 |
| 10 | 926 |
| 11 | 2004 |
| 12 | 4357 |
| 13 | 9443 |
| 14 | 20510 |
| 15 | 44482 |
| 16 | 96569 |
| 17 | 209505 |
| 18 | 454730 |
| 19 | 986676 |
| 20 | 2141361 |
| 21 | 4646659 |
| 22 | 10084066 |
| 23 | 21882682 |
| 24 | 47488221 |
| 25 | 103052201 |
| 26 | 223634182 |
| 27 | 485302564 |
| 28 | 1053152909 |
| 29 | 2285426419 |
| 30 | 4959582582 |
| 31 | 10762708930 |
| 32 | 23356030257 |
| 33 | 50684574465 |