cp's OEIS Frontend

A214278 Number of compositions of n where the difference between largest and smallest parts equals 9 and adjacent parts are unequal.

%I A214278 #9 Jan 03 2019 15:14:54
%S A214278 0,2,1,8,12,23,56,100,196,380,734,1360,2583,4831,8933,16629,30627,
%T A214278 56359,103401,189241,345386,629284,1144379,2076985,3764633,6812624,
%U A214278 12312124,22223544,40067505,72159773,129826552,233358096,419077220,751979608,1348268372
%N A214278 Number of compositions of n where the difference between largest and smallest parts equals 9 and adjacent parts are unequal.
%H A214278 Alois P. Heinz, <a href="/A214278/b214278.txt">Table of n, a(n) for n = 10..2000</a>
%e A214278 a(11) = 2: [10,1], [1,10].
%e A214278 a(12) = 1: [1,10,1].
%e A214278 a(13) = 8: [2,11], [2,10,1], [2,1,10], [11,2], [10,2,1], [10,1,2], [1,2,10], [1,10,2].
%e A214278 a(14) = 12: [3,10,1], [3,1,10], [2,1,10,1], [10,3,1], [10,1,3], [10,1,2,1], [1,3,10], [1,2,10,1], [1,2,1,10], [1,10,3], [1,10,2,1], [1,10,1,2].
%Y A214278 Column k=9 of A214269.
%K A214278 nonn
%O A214278 10,2
%A A214278 _Alois P. Heinz_, Jul 09 2012