A256094 Alternating row sums of array A255250.

1, 2, 2, 3, 4, 3, 4, 5, 4, 6, 7, 7, 8, 8, 7, 8, 8, 10, 10, 12, 13, 14, 11, 13, 13, 11, 14, 16, 15, 18, 17, 16, 15, 17, 17, 20, 20, 23, 23, 21, 21, 21, 19, 23, 22, 24, 26, 26, 23, 25, 24, 28, 29, 31, 30, 32, 29, 31, 28, 29, 31

Offset: 0

Author

Wolfdieter Lang, Mar 14 2015

Keywords

• nonn
• easy

Comments

See A255250 for a comment on Gauss's circle problem in an octant and a link.

Crossrefs

Cf. A255250.

Formula

a(n) = sum((-1)^m*T(n, m), m=0..floor(n/sqrt(2))), n >= 0, with T(n, m) = A255250(n, m) = floor(sqrt(n^2 - m^2)) - (m-1).