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A054153 Number of positive integers <= 2^n of form x^2 + 9 y^2. 0
1, 1, 2, 2, 6, 8, 18, 30, 57, 103, 194, 360, 682, 1292, 2464, 4721, 9078, 17481, 33808, 65485, 127116, 247179, 481426, 938950, 1833572, 3584679, 7015237, 13741715, 26940645, 52858250, 103785060, 203913141, 400891200, 788601863, 1552114600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

Index entries for sequences related to populations of quadratic forms

CROSSREFS

Sequence in context: A136513 A214932 A322132 * A000673 A276425 A129383

Adjacent sequences:  A054150 A054151 A054152 * A054154 A054155 A054156

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified September 23 22:32 EDT 2020. Contains 337315 sequences. (Running on oeis4.)