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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 11 |
| 6 | 31 |
| 7 | 71 |
| 8 | 155 |
| 9 | 379 |
| 10 | 1051 |
| 11 | 2971 |
| 12 | 8053 |
| 13 | 21165 |
| 14 | 56057 |
| 15 | 152881 |
| 16 | 425491 |
| 17 | 1186227 |
| 18 | 3287971 |
| 19 | 9102787 |
| 20 | 25346457 |
| 21 | 71111377 |
| 22 | 200425149 |
| 23 | 565676629 |
| 24 | 1597672277 |
| 25 | 4520632981 |
| 26 | 12827046181 |
| 27 | 36493762501 |
| 28 | 104027787451 |
| 29 | 296947847203 |
| 30 | 848765305351 |
| 31 | 2429671858671 |