A054187 Number of positive integers <= 2^n of form 7 x^2 + 8 y^2.

0, 0, 0, 2, 3, 5, 9, 17, 30, 57, 105, 199, 373, 701, 1345, 2575, 4954, 9562, 18509, 35916, 69837, 136010, 265251, 518118, 1013282, 1983707, 3887580, 7625434, 14969119, 29407328, 57811961, 113724176, 223843323, 440828855, 868596930