Search: id:A088991
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%I A088991
%S A088991 1,0,4,32,432,7424,157120,3949056,114972928,3805503488,141137150976,5797706178560,
%T A088991 261309106499584,12821127008550912,680286677982625792,38814037079505895424,
%U A088991 2369659425449311272960,154142301601844298776576,10642813349855965483368448
%N A088991 Derangement numbers d(n,4) where d(n,k) = k(n-1)(d(n-1,k) + d(n-2,k)), 
               with d(0,k) = 1 and d(1,k) = 0.
%F A088991 Inverse binomial transform of A007696. E.g.f.: exp(-x)/(1-4*x)^(1/4). 
               - Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 17 2003
%Y A088991 Cf. A000166, A053871, A033030, A088992.
%Y A088991 Sequence in context: A127670 A005172 A140178 this_sequence A009668 A005121 
               A037964
%Y A088991 Adjacent sequences: A088988 A088989 A088990 this_sequence A088992 A088993 
               A088994
%K A088991 nonn,easy
%O A088991 0,3
%A A088991 N. J. A. Sloane (njas(AT)research.att.com), Nov 02 2003

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