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%I #8 Feb 17 2021 21:03:51
%S 0,2,7,8,16,17,18,29,30,31,32,46,47,48,49,50,67,68,69,70,71,72,92,93,
%T 94,95,96,97,98,121,122,123,124,125,126,127,128,154,155,156,157,158,
%U 159,160,161,162,191,192,193,194,195,196,197,198,199,200,232,233,234
%N Row 2 of semigroup multiplication table shown in A341317 and A341318.
%H Alois P. Heinz, <a href="/A341706/b341706.txt">Table of n, a(n) for n = 0..10000</a>
%p t:= n-> n*(n-1)/2:
%p f:= n-> ceil((sqrt(1+8*n)-1)/2):
%p g:= n-> (x-> [x, n-t(x)][])(f(n)):
%p a:= n-> (h-> t(h[1]*h[3])+h[2]*h[4])(map(g, [n, 2])):
%p seq(a(n), n=0..60); # _Alois P. Heinz_, Feb 17 2021
%Y Cf. A341317, A341318.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Feb 17 2021
%E More terms from _Alois P. Heinz_, Feb 17 2021
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