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A054173
Number of positive integers <= 2^n of form 4 x^2 + 9 y^2.
0
0, 0, 1, 1, 4, 5, 10, 18, 35, 65, 120, 225, 430, 814, 1549, 2981, 5739, 11084, 21474, 41663, 81033, 157830, 307912, 601482, 1176314, 2302911, 4513106, 8851907, 17376317, 34134944, 67101922, 131990741, 259779732, 511566355, 1007901666
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OFFSET
0,5
LINKS
Table of n, a(n) for n=0..34.
Index entries for sequences related to populations of quadratic forms
CROSSREFS
Cf.
A020684
.
Sequence in context:
A022309
A049897
A049867
*
A391881
A185875
A393602
Adjacent sequences:
A054170
A054171
A054172
*
A054174
A054175
A054176
KEYWORD
nonn
AUTHOR
David W. Wilson
STATUS
approved
