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

0,2

Comments

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

Links

Table of n, a(n) for n=0..60.

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).

Crossrefs

Cf. A255250.

Sequence in context: A328804 A064514 A112342 * A063712 A340458 A185977

Adjacent sequences: A256091 A256092 A256093 * A256095 A256096 A256097

Keyword

nonn,easy

Author

Wolfdieter Lang, Mar 14 2015

Status

approved