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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 6 |
| 8 | 11 |
| 9 | 19 |
| 10 | 34 |
| 11 | 62 |
| 12 | 112 |
| 13 | 202 |
| 14 | 365 |
| 15 | 659 |
| 16 | 1189 |
| 17 | 2146 |
| 18 | 3874 |
| 19 | 6993 |
| 20 | 12623 |
| 21 | 22786 |
| 22 | 41131 |
| 23 | 74245 |
| 24 | 134019 |
| 25 | 241917 |
| 26 | 436683 |
| 27 | 788254 |
| 28 | 1422873 |
| 29 | 2568420 |
| 30 | 4636240 |
| 31 | 8368850 |
| 32 | 15106563 |
| 33 | 27268770 |
| 34 | 49222700 |
| 35 | 88851613 |
| 36 | 160385536 |
| 37 | 289511009 |
| 38 | 522594658 |
| 39 | 943332613 |
| 40 | 1702804277 |