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%I #10 Jun 06 2021 02:52:20
%S 2,5,11,17,28,40,58,74,91,117,140,168,195,225,263,298,334,371,411,453,
%T 497,547,597,647,698,754,815,878,942,1008,1074,1149,1233,1316,1398,
%U 1483,1570,1657,1751,1843,1936,2044,2152,2262,2371
%N T(n,1) + T(n,n), array T given by A048201.
%F a(n) = 2*A004978(n+1) - A004978(n) - 1. - _Sean A. Irvine_, Jun 05 2021
%Y Cf. A004978.
%K nonn
%O 1,1
%A _Clark Kimberling_
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