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 | -2 |
| 1 | 3 |
| 2 | 4 |
| 3 | 11 |
| 4 | 26 |
| 5 | 63 |
| 6 | 152 |
| 7 | 367 |
| 8 | 886 |
| 9 | 2139 |
| 10 | 5164 |
| 11 | 12467 |
| 12 | 30098 |
| 13 | 72663 |
| 14 | 175424 |
| 15 | 423511 |
| 16 | 1022446 |
| 17 | 2468403 |
| 18 | 5959252 |
| 19 | 14386907 |
| 20 | 34733066 |
| 21 | 83853039 |
| 22 | 202439144 |
| 23 | 488731327 |
| 24 | 1179901798 |
| 25 | 2848534923 |
| 26 | 6876971644 |
| 27 | 16602478211 |
| 28 | 40081928066 |
| 29 | 96766334343 |
| 30 | 233614596752 |
| 31 | 563995527847 |