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A000021 Number of positive integers <= 2^n of form x^2 + 12 y^2.
(Formerly M0357 N0134)
+0
2
1, 1, 2, 2, 6, 9, 17, 30, 54, 98, 183, 341, 645, 1220, 2327, 4451, 8555, 16489, 31859, 61717, 119779, 232919, 453584, 884544, 1727213, 3376505, 6607371, 12942012, 25371540, 49777187, 97731027, 192010355, 377475336, 742512992, 1461352025, 2877572478, 5668965407 (list; graph; listen)
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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.


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