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%I #12 Apr 14 2021 07:32:37
%S 1,1,2,3,20,100,612,4389,35688,325395,3288490,36489992,441093864,
%T 5770007009,81213878830,1223895060315,19662509071056,335472890422812,
%U 6057979285535388,115434096553014565,2314691409652237700,48723117262650147387,1074208020519710570054
%N Number of permutations of length n without modular 3-sequences.
%C Modular 3-sequences are of the following form: i,i+1,i+2, where arithmetic is modulo n.
%H Alois P. Heinz, <a href="/A165960/b165960.txt">Table of n, a(n) for n = 0..450</a>
%F a(n) = n * A165961(n).
%e For n=3 the a(3) = 3 solutions are (0,2,1), (1,0,2) and (2,1,0).
%Y Cf. A002628, A165961, A165962.
%K nonn
%O 0,3
%A _Isaac Lambert_, Oct 01 2009
%E a(0)-a(2) and a(15)-a(22) from _Alois P. Heinz_, Apr 14 2021