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 | 0 |
| 1 | 3 |
| 2 | 12 |
| 3 | 34 |
| 4 | 98 |
| 5 | 256 |
| 6 | 654 |
| 7 | 1625 |
| 8 | 3964 |
| 9 | 9533 |
| 10 | 22662 |
| 11 | 53373 |
| 12 | 124728 |
| 13 | 289572 |
| 14 | 668514 |
| 15 | 1535869 |
| 16 | 3513614 |
| 17 | 8008090 |
| 18 | 18191184 |
| 19 | 41200568 |
| 20 | 93064834 |
| 21 | 209710139 |
| 22 | 471520566 |
| 23 | 1058065647 |
| 24 | 2369890254 |
| 25 | 5299215579 |
| 26 | 11830941840 |
| 27 | 26375563624 |
| 28 | 58722396932 |
| 29 | 130576680919 |