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%I #9 Mar 27 2021 15:22:31
%S 1,23,719,40319,3628799,479001599,87178291199,20922789887999,
%T 6402373705727999,2432902008176639999,1124000727777607679999,
%U 620448401733239439359999,403291461126605635583999999,304888344611713860501503999999,265252859812191058636308479999999
%N a(n) = (2n)! - 1.
%F a(n) = -1 + A010050(n).
%t Table[(2n)! - 1, {n, 1, 30}]
%Y Cf. A010050, A028387, A062938, A127227, A127228, A127229, A127231.
%K nonn
%O 1,2
%A _Artur Jasinski_, Jan 09 2007
%E Entry revised by _Alois P. Heinz_, Mar 27 2021
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