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A054166 Number of positive integers <= 2^n of form 3 x^2 + 9 y^2. 0
0, 0, 1, 1, 3, 5, 10, 17, 32, 56, 106, 195, 365, 691, 1308, 2495, 4773, 9174, 17671, 34144, 66131, 128330, 249482, 485761, 947206, 1849299, 3614605, 7072464, 13851148, 27150649, 53262111, 104562496, 205412762, 403786919, 794202162 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..34.

Index entries for sequences related to populations of quadratic forms

CROSSREFS

Sequence in context: A018072 A090170 A301751 * A265317 A054157 A215982

Adjacent sequences:  A054163 A054164 A054165 * A054167 A054168 A054169

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified August 7 11:38 EDT 2022. Contains 355985 sequences. (Running on oeis4.)