A269122 - OEIS

%I #12 Mar 11 2016 12:07:11

%S 1,23,1879,173891,16140983,1474050783,132279480115,11690616534627,

%T 1020149742404727,88094027572412735,7541872062618216079,

%U 641058122723345275763,54163773797158984485203,4553249681522845632696611,381122944171897823109474291

%N Number of sequences with n copies each of 1,2,3,4 avoiding the pattern 1234.

%H Alois P. Heinz, <a href="/A269122/b269122.txt">Table of n, a(n) for n = 0..525</a>

%F a(n) = A008977(n) - A268840(n).

%Y Row n=4 of A269129.

%Y Cf. A008977, A268840.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Feb 19 2016