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 | 2 |
| 2 | 10 |
| 3 | 74 |
| 4 | 740 |
| 5 | 9354 |
| 6 | 143144 |
| 7 | 2573586 |
| 8 | 53180944 |
| 9 | 1242078802 |
| 10 | 32358633632 |
| 11 | 930370449370 |
| 12 | 29264294868544 |
| 13 | 999646208968666 |
| 14 | 36852747307934336 |
| 15 | 1458402092927302178 |
| 16 | 61665517131334975744 |
| 17 | 2774522039432235946914 |