References to A147614

a(n) = number of grid points that are covered after n-th stage of A139250, assuming the toothpicks have length 2.
0, 3, 7, 13, 19, 27, 39, 53, 63, 71, 83, 99, 119, 147, 183, 217, 235, 243, 255, 271, 291

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