The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #10 Feb 09 2021 02:47:06
%S 1,1,3,7,19,69,249,1025,4833,21481,126517,615669,4161321,22894537,
%T 163938841,1016069027,8491341479,58444280449,508568676159,
%U 3894634611571,33778806941777,290707450961639,2713715752910365,26549031384321585,233708327564162305,2519255296395164039,24379835547221372041
%N a(n) = Sum_{k=1..n+1} |A341287(n,k)|.
%e a(7) = Sum_{k=1..8} |A341287(7,k)| = |-50| + |267| + |-98| + |-364| + |105| + |119| + |21| + 1 = 1025.
%Y Cf. A341287.
%K nonn
%O 0,3
%A _Petros Hadjicostas_, Feb 08 2021