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) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 23 |
| 4 | 47 |
| 5 | 91 |
| 6 | 169 |
| 7 | 291 |
| 8 | 494 |
| 9 | 815 |
| 10 | 1295 |
| 11 | 2043 |
| 12 | 3155 |
| 13 | 4775 |
| 14 | 7165 |
| 15 | 10599 |
| 16 | 15458 |
| 17 | 22455 |
| 18 | 32145 |
| 19 | 45659 |
| 20 | 64519 |
| 21 | 90247 |
| 22 | 125493 |
| 23 | 173515 |
| 24 | 238153 |
| 25 | 325423 |
| 26 | 442169 |
| 27 | 597575 |
| 28 | 804203 |
| 29 | 1077283 |
| 30 | 1436593 |
| 31 | 1908571 |
| 32 | 2525611 |
| 33 | 3329391 |
| 34 | 4373969 |
| 35 | 5726611 |
| 36 | 7472763 |
| 37 | 9721983 |
| 38 | 12608475 |
| 39 | 16305179 |
| 40 | 21027921 |
| 41 | 27043631 |
| 42 | 34689187 |
| 43 | 44385995 |
| 44 | 56652421 |
| 45 | 72137483 |
| 46 | 91645813 |
| 47 | 116167379 |
| 48 | 146932651 |
| 49 | 185456419 |
| 50 | 233594265 |