A054173 Number of positive integers <= 2^n of form 4 x^2 + 9 y^2.

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

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 * A185875 A354080 A049898

Adjacent sequences: A054170 A054171 A054172 * A054174 A054175 A054176

Keyword

nonn

Author

David W. Wilson

Status

approved