%I A121966
%S A121966 1,2,1,3,6,6,36,0,252,252,2016,4536,17640,72072,157248,1166256,1192464,
%T A121966 19852560,419328,357765408,349798176,6805509984,14151271680,135569947968,
%U A121966 461049196608,2792629554624,14318859469824,58289508950400,444898714635648
%V A121966 1,2,1,-3,-6,6,36,0,-252,-252,2016,4536,-17640,-72072,157248,1166256,-1192464,
%W A121966 -19852560,419328,357765408,349798176,-6805509984,-14151271680,135569947968,
%X A121966 461049196608,-2792629554624,-14318859469824,58289508950400,444898714635648
%N A121966 a(n) = a(n-1)-(n-1)*a(n-2).
%C A121966 Hermite type recursion suggested by H[n+1]=x*H[n]-n*H[n-1]; x=1.
%D A121966 Eugene Jahnke and Fritz Emde, Table of Functions with Formulae and Curves, 
               Dover Book, New York,1945, page 32
%t A121966 a[0] = 1; a[1] = 2; a[n_] := a[n] = a[n - 1] - (n - 1)*a[n - 2] Table[a[n], 
               {n, 0, 30}]
%Y A121966 Cf. A001503.
%Y A121966 Sequence in context: A063707 A118287 A024930 this_sequence A021472 A053225 
               A050043
%Y A121966 Adjacent sequences: A121963 A121964 A121965 this_sequence A121967 A121968 
               A121969
%K A121966 sign
%O A121966 1,2
%A A121966 Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 02 2006