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A054231
Number of positive integers <= 2^n of form x^2 + 18 y^2.
0
1, 1, 2, 2, 4, 9, 15, 28, 51, 94, 177, 329, 624, 1180, 2253, 4318, 8285, 15984, 30872, 59824, 116113, 225769, 439726, 857599, 1674693, 3274082, 6407312, 12550839, 24605967, 48277606, 94791459, 186243530, 366154704, 720274798, 1417642821
OFFSET
0,3
CROSSREFS
Sequence in context: A066346 A175390 A054233 * A054230 A054232 A100048
KEYWORD
nonn
STATUS
approved