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%I #16 Oct 20 2023 15:54:13
%S 5,18,456,1056,29184,67584,1867776,130154496,270532608,33420214272,
%T 481573208064,1133871366144,31336081391616,2183630092763136,
%U 139646772820574208,290482175965396992,35884681830888112128,517085294816170868736,1217485108864830406656
%N Second differences of Mersenne numbers A001348, divided by 4.
%H Paolo Xausa, <a href="/A139243/b139243.txt">Table of n, a(n) for n = 1..450</a>
%F a(n) = A139241(n)/4 = A139242(n)/2.
%t Differences[2^Prime[Range[25]]-1,2]/4 (* _Paolo Xausa_, Oct 20 2023 *)
%Y Cf. A001348, A139237, A139239, A139240, A139241, A139242.
%K easy,nonn
%O 1,1
%A _Omar E. Pol_, Apr 19 2008
%E More terms from _Alois P. Heinz_, Mar 13 2020
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