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%I #12 Apr 07 2026 08:40:39
%S 2,2,3,1,3,0,1,6,0,1,4,8,4,2,9,8,2,8,9,3,3,2,8,0,4,7,0,7,6,4,0,1,2,5,
%T 2,1,3,4,2,1,7,1,6,2,9,3,6,1,0,7,9,3,2,8,7,4,3,8,3,5,3,1,8,7,6,0,3,2,
%U 5,1,6,6,6,3,1,3,1,4,4,4,1,1,7,7,5,6,3,7,3,0,3,3,2,5,7,7,5,9,0,7
%N Decimal expansion of e^(-3/2).
%C This constant gives the asymptotic probability that a randomly selected permutation of length n is a 2-derangement (see Bona at p. 410): A038205(n) ~ exp(-3/2)*n!.
%D Miklos Bona, Introduction to Enumerative and Analytic Combinatorics, CRC Press, 2025, p. 410.
%e 0.22313016014842982893328047076401252134217162936...
%t RealDigits[Exp[-3/2],10,100][[1]]
%Y Cf. A001113, A038205.
%K nonn,cons,easy
%O 0,1
%A _Stefano Spezia_, Apr 07 2026