%I #7 Nov 26 2023 10:58:01
%S 0,1,3,8,21,53,129,305,705,1601,3585,7937,17409,37889,81921,176129,
%T 376833,802817,1703937,3604481,7602177,15990785,33554433,70254593,
%U 146800641,306184193,637534209,1325400065,2751463425,5704253441,11811160065,24427626497,50465865729
%N a(0)=0; thereafter a(n) = (3*n+1)*2^(n-2)+1.
%t Join[{0,1},Table[(3n+1)2^(n-2)+1,{n,40}]] (* _Harvey P. Dale_, Nov 26 2023 *)
%Y Essentially the first column of the triangular array in A151747.
%Y Partial sums of A098156.
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Jan 07 2010
%E Zero prepended by _Harvey P. Dale_, Nov 26 2023