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 | 16 |
| 2 | 170 |
| 3 | 1520 |
| 4 | 12411 |
| 5 | 96096 |
| 6 | 719860 |
| 7 | 5278240 |
| 8 | 38153621 |
| 9 | 273134576 |
| 10 | 1942326750 |
| 11 | 13748476560 |
| 12 | 97001079631 |
| 13 | 682818667456 |
| 14 | 4798793396840 |
| 15 | 33686888924480 |
| 16 | 236284962774441 |
| 17 | 1656378634646736 |
| 18 | 11606570499786130 |