A269113 - OEIS

%I #6 Feb 23 2016 11:55:59

%S 0,0,1,374,173891,117392909,117108036719,171248808285596,

%T 360953073372968159,1072323973643442736211,4376906243609822466600689,

%U 23919710914189027455648239834,170865299381465355439286870245691,1561721420156259852074018974532765369

%N Number of sequences with 3 copies each of 1,2,...,n avoiding the pattern 12...n.

%H Alois P. Heinz, <a href="/A269113/b269113.txt">Table of n, a(n) for n = 0..165</a>

%F a(n) = A014606(n) - A047910(n).

%Y Column k=3 of A269129.

%Y Cf. A014606, A047910.

%K nonn

%O 0,4

%A _Alois P. Heinz_, Feb 19 2016