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%I #6 Oct 29 2025 11:52:21
%S 1,1,3,11,43,183,815,3751,17713,85317,417539,2070355,10378707,
%T 52513683,267833407,1375511991,7107227481,36920353577,192710512163,
%U 1010189811763,5315874933075,28071323867887,148706825853775
%N Recip transform of 2*(1 + x^4)-1/(1-x).
%C Sign diagram of generating sequence: +---+----------... Definition in A049150.
%K nonn
%O 0,3
%A _Olivier Gérard_