login
A062862
Number of ways n can be written as the sum of squares of consecutive numbers (possibly including squares of negative numbers).
2
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
0,2
EXAMPLE
a(25)=4 since 25 = 5^2 = 3^2+4^2 = (-4)^2+(-3)^2 = (-5)^2.
CROSSREFS
If a(n) is zero then n is in A062863, otherwise in A062861. If a(n) is odd then n is in A006331.
Sequence in context: A369923 A249094 A096501 * A206799 A084119 A166073
KEYWORD
nonn
AUTHOR
Henry Bottomley, Jun 25 2001
STATUS
approved