This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A139328 #8 Sep 27 2024 05:37:40
%S A139328 0,3,6,10,14,19,24,30,36,45,52,60,67,76,86,96,105,117,127,138,151,162,
%T A139328 176,189,203,216,230,246,262,277,292,308,325,343,362,376,398,417,435,
%U A139328 451,473,491,515,535,557,579,599,622,646,668,691,712,737,764,788,815
%N A139328 Sums of rows of the triangle in A139325.
%C A139328 a(n) = Sum_{k=1..n} A139325(n,k).
%F A139328 a(n) = A000720(2*n^2 - 1) - 1.
%e A139328 a(4) = #{3,5,7}+#{11,13}+#{17,19,23}+#{29,31} = 3+2+3+2 = 10:
%e A139328 ..1 ...3 ...5 ...7 ... primes in first row = {3,5,7},
%e A139328 ..9 ..11 ..13 ..15 ... primes in 2nd row = {11,13},
%e A139328 .17 ..19 ..21 ..23 ... primes in 3rd row = {17,19,23},
%e A139328 .25 ..27 ..29 ..31 ... primes in 4th row = {29,31}.
%Y A139328 Cf. A000720, A038107, A139325.
%K A139328 nonn
%O A139328 1,2
%A A139328 _Reinhard Zumkeller_, Apr 14 2008