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A360965 Array T(n,m) = (2^(n*m)-1)/(2^m-1) read by antidiagonals, n,m>=1.

%I A360965 #5 Feb 27 2023 07:05:07
%S A360965 1,1,3,1,5,7,1,9,21,15,1,17,73,85,31,1,33,273,585,341,63,1,65,1057,
%T A360965 4369,4681,1365,127,1,129,4161,33825,69905,37449,5461,255,1,257,16513,
%U A360965 266305,1082401,1118481,299593,21845,511,1,513,65793,2113665,17043521,34636833,17895697,2396745,87381,1023
%N A360965 Array T(n,m) = (2^(n*m)-1)/(2^m-1) read by antidiagonals, n,m>=1.
%H A360965 Quynh Nguyen, Jean Pedersen, and Hien T. Vu, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL19/Pedersen/pedersen2.html">New Integer Sequences Arising From 3-Period Folding Numbers</a>, JIS vol 19 (2016) #16.3.1 table 1.
%F A360965 T(n,m) = (2^(n*m)-1)/(2^m-1) for n>1.
%e A360965 The array starts in rows n>=1 and columns m>=1 as
%e A360965    1    1    1     1       1
%e A360965    3    5    9    17      33
%e A360965    7   21   73   273    1057
%e A360965   15   85  585  4369   33825
%e A360965   31  341 4681 69905 1082401
%Y A360965 Cf. A000225 (first col), A002450 (2nd col), A023001 (3rd col)
%K A360965 nonn,tabl,easy
%O A360965 1,3
%A A360965 _R. J. Mathar_, Feb 27 2023