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 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 144 |
| 5 | 610 |
| 6 | 2584 |
| 7 | 10946 |
| 8 | 46368 |
| 9 | 196418 |
| 10 | 832040 |
| 11 | 3524578 |
| 12 | 14930352 |
| 13 | 63245986 |
| 14 | 267914296 |
| 15 | 1134903170 |
| 16 | 4807526976 |
| 17 | 20365011074 |
| 18 | 86267571272 |
| 19 | 365435296162 |
| 20 | 1548008755920 |
| 21 | 6557470319842 |
| 22 | 27777890035288 |
| 23 | 117669030460994 |
| 24 | 498454011879264 |
| 25 | 2111485077978050 |