A054231 Number of positive integers <= 2^n of form x^2 + 18 y^2.

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

Links

Table of n, a(n) for n=0..34.

Crossrefs

Sequence in context: A066346 A175390 A054233 * A054230 A054232 A100048

Adjacent sequences: A054228 A054229 A054230 * A054232 A054233 A054234

Keyword

nonn

Author

David W. Wilson

Status

approved