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 | 3 |
| 2 | 9 |
| 3 | 21 |
| 4 | 48 |
| 5 | 102 |
| 6 | 213 |
| 7 | 421 |
| 8 | 819 |
| 9 | 1542 |
| 10 | 2854 |
| 11 | 5172 |
| 12 | 9240 |
| 13 | 16233 |
| 14 | 28182 |
| 15 | 48288 |
| 16 | 81862 |
| 17 | 137295 |
| 18 | 228153 |
| 19 | 375658 |
| 20 | 613554 |
| 21 | 994155 |
| 22 | 1599309 |
| 23 | 2554932 |
| 24 | 4055406 |
| 25 | 6397160 |
| 26 | 10032907 |
| 27 | 15647277 |
| 28 | 24275455 |
| 29 | 37471066 |
| 30 | 57562533 |
| 31 | 88018488 |
| 32 | 133996590 |
| 33 | 203126712 |
| 34 | 306671525 |
| 35 | 461184246 |
| 36 | 690935892 |
| 37 | 1031379271 |