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%I #4 Mar 30 2012 18:40:38
%S 1,5,12,21,31,43,57,73,92,112,135,160,187,215,246,278,318,353,392,432,
%T 477,525,576,628,683,739,798,857,920,986,1055,1128,1203
%N Rounded partial sum of atomic weights of first n elements.
%e a(1) = round(1.0080) = 1 = mean atomic weight of hydrogen (protium + deuterium + tritium).
%e a(2) = round (1.0080+4.003) = round(5.011) = 5 (heium 4 and rarer helium 3).
%Y Cf. A007656, A070217.
%K nonn
%O 1,2
%A _Jonathan Vos Post_, Aug 24 2006
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