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A131948 Triangle T(n,k) = 2*A002024(n+1,k+1) + A007318(n,k) - 2, read by rows.

%I A131948 #7 Oct 16 2012 10:01:43
%S A131948 1,3,3,5,6,5,7,9,9,7,9,12,14,12,9,11,15,20,20,15,11,13,18,27,32,27,18,
%T A131948 13,15,21,35,49,49,35,21,15,17,24,44,72,86,72,44,24,17,19,27,54,102,
%U A131948 144,144,102,54,27,19
%N A131948 Triangle T(n,k) = 2*A002024(n+1,k+1) + A007318(n,k) - 2, read by rows.
%C A131948 Row sums = A131949.
%F A131948 2*A002024 + A007318 - 2*A000012 as infinite lower triangular matrices.
%e A131948 First few rows of the triangle are:
%e A131948 1;
%e A131948 3, 3;
%e A131948 5, 6, 5;
%e A131948 7, 9, 9, 7;
%e A131948 9, 12, 14, 12, 9;
%e A131948 11, 15, 20, 20, 15, 11;
%e A131948 13, 18, 27, 32, 27, 18, 13;
%e A131948 15, 21, 35, 49, 49, 35, 21, 15;
%e A131948 ...
%Y A131948 Cf. A002024, A007318, A131949.
%K A131948 nonn,tabl
%O A131948 0,2
%A A131948 _Gary W. Adamson_, Jul 30 2007