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%I #2 May 20 2014 14:52:32
%S 1,9,-11,33
%N Level sums of A129398.
%e a(2)=-11 because it is the sum of all elements for h=2 in A129398:
%e .....1
%e ..1.-3..1
%e 1.-3.-7.-3..1
%e ..1..3..1
%e .....1
%Y Cf. A129398.
%K sign
%O 0,2
%A _Jonas Wallgren_, Apr 13 2007
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