A202820 The left-hand half-triangle of A202704.
0, 0, 0, 1, 1, 1, 3, 2, 1, 0, 17, 20, 22, 23, 23, 105, 88, 68, 46, 23, 0
Offset: 1
Examples
Triangle begins: 0 0 0 1 1 1 3 2 1 0 17 20 22 23 23 105 88 68 46 23 0
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.