%I #10 Mar 08 2023 12:24:22
%S 2,4,31,304,40044,500522,86094668,1167752848,225001039696,
%T 652498288154820,9451735761626880,29731605314969017772,
%U 6529673496702876605072,97300805803445759460364
%N Q(p)/p where p runs through the primes and Q(k) is the k-th central quadrinomial coefficient (A005190).
%H M. F. Hasler, <a href="/A087186/b087186.txt">Table of n, a(n) for n = 1..100</a>
%Y Cf. A005190.
%K nonn
%O 1,1
%A _Benoit Cloitre_, Oct 19 2003