Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
%I
%S 3,11,38,58,108,140,176,216,305,357,469,533,601,673,824,908,1082,1178,
%T 1375,1483,1703,1823,1947,2075,2334,2474,2756,2908,3064,3224,3545,
%U 3717,4061,4245,4612,4808,5198,5406,5618,5834
%N a(n) = sum of the numbers between the two n's in A026358.
%K nonn
%O 2,1
%A _Clark Kimberling_