A215283 - OEIS

A215283

Row sums of triangle A215200.

1, 1, 2, 2, 0, 2, 2, 0, 6, 2, 6, 0, 2, 4, 4, 8, 4, 0, 8, 0, 0, 2, 4, 0, 14, 6, 2, 0, -2, 4, 8, 0, 2, 4, 12, 12, 4, 6, 10, 0, 10, 4, 8, 0, 2, 4, 6, 0, 32, 2, 12, 0, 0, 2, 12, 0, 2, 2, 18, 0, 2, 8, 2, 32, 10, 8, 8, 0, 0, 4, 12, 0, -2, 10, 6, 0, 0, 4, 18, 0, 42

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OFFSET

1,3

COMMENTS

The unsigned version of A215200 is A054521 which has as row sums the Euler totient function A000010.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = Sum_{k=1..n} (n-k | k) where (i | j) is the Kronecker symbol.

MAPLE

f:= n -> add(numtheory:-jacobi(n-k, k), k=1..n); # Robert Israel, Mar 11 2018

MATHEMATICA