A062862 Number of ways n can be written as the sum of squares of consecutive numbers (possibly including squares of negative numbers).

1, 4, 1, 0, 2, 4, 2, 0, 0, 2, 1, 0, 0, 2, 4, 2, 2, 0, 0, 2, 0, 0, 0, 0, 0, 4, 0, 0, 1, 2, 4, 2, 0, 0, 0, 2, 2, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 2, 2, 0, 0, 0, 2, 4, 2, 0, 0, 0, 3, 2, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 4, 2, 0, 0, 0, 2, 4, 2, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0

Offset: 0

Author

Henry Bottomley, Jun 25 2001

Keywords

• nonn

Examples

			a(25)=4 since 25 = 5^2 = 3^2+4^2 = (-4)^2+(-3)^2 = (-5)^2.
		

Links

• Index entries for sequences related to sums of squares

Crossrefs

If a(n) is zero then n is in A062863, otherwise in A062861. If a(n) is odd then n is in A006331.