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a(n) = T(n,n+1), array T as in A049627.
0

%I #9 Aug 06 2021 04:53:55

%S 2,5,8,12,18,24,32,42,52,62,76,90,106,124,138,154,178,200,224,250,270,

%T 292,324,354,382,414,444,474,514,550,588,634,670,706,746,782,830,884,

%U 926,966,1022,1074,1128,1190,1234,1280,1348,1410,1468,1530,1582,1638

%N a(n) = T(n,n+1), array T as in A049627.

%o (PARI) T(n,k) = (n+1)*(k+1) - sum(i=0, n, sum(j=0, k, gcd(i,j)>1)); \\ A049627

%o a(n) = T(n, n+1); \\ _Michel Marcus_, Aug 06 2021

%Y Cf. A049627.

%K nonn

%O 0,1

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Aug 05 2021