A383331 Number of pairs of nonnegative integers, not both equal to 0, with a shortest vectorial addition chain of length n.
2, 3, 7, 16, 37, 91, 229, 585, 1528, 4034, 10862
Offset: 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.
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