A000217: Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n
A000217 ➡️ https://oeis.org/A000217

3D graph, threejs - webGL ➡️ https://decompwlj.com/3Dgraph/Triangular_numbers.html
3D graph Gen, threejs animation ➡️ https://decompwlj.com/3DgraphGen/Triangular_numbers.html
2D graph, first 500 terms ➡️ https://decompwlj.com/2Dgraph500terms/Triangular_numbers.html

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