OFFSET
1,2
EXAMPLE
For n = 4, A007955(n) = b(n): a(4) = b(1)*b(4) + b(2)*b(3) + b(3)* b(2) + b(4)*b(1) = 1*8 + 2*3 + 3*2 + 8*1 = 28.
MATHEMATICA
s[n_] := n^(DivisorSigma[0, n]/2); a[n_] := Sum[s[k] * s[n-k+1], {k, 1, n}]; Array[a, 50] (* Amiram Eldar, Aug 06 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Apr 02 2010
EXTENSIONS
More terms from Amiram Eldar, Aug 06 2024
STATUS
approved