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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
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..34.
Index entries for sequences related to populations of quadratic forms
CROSSREFS
Cf.
A000079
,
A020672
.
Sequence in context:
A365662
A214932
A322132
*
A000673
A355640
A370586
Adjacent sequences:
A054150
A054151
A054152
*
A054154
A054155
A054156
KEYWORD
nonn
,
more
AUTHOR
David W. Wilson
STATUS
approved
