cp's OEIS Frontend

A189319 Number of nondecreasing arrangements of n+2 numbers in 0..n with the last equal to n and each after the second equal to the sum of one or two of the preceding four.

%I A189319 #8 Jul 22 2025 11:41:22
%S A189319 2,6,11,32,54,179,253,866,1161,3234,4100,12289,11179,28957,35448,
%T A189319 81956,60820,184122,127607,389213,298758,584334,434068,1773649,705685,
%U A189319 1778949,1505153,3979185,1735705,7116031,2564548,11409548,5647305,10489351
%N A189319 Number of nondecreasing arrangements of n+2 numbers in 0..n with the last equal to n and each after the second equal to the sum of one or two of the preceding four.
%C A189319 Diagonal of A189326
%H A189319 R. H. Hardin, <a href="/A189319/b189319.txt">Table of n, a(n) for n = 1..57</a>
%e A189319 All solutions for n=3
%e A189319 ..0....1....3....0....1....2....1....1....1....1....1
%e A189319 ..3....2....3....1....3....3....1....1....2....2....1
%e A189319 ..3....3....3....1....3....3....1....2....2....2....2
%e A189319 ..3....3....3....2....3....3....2....3....2....3....2
%e A189319 ..3....3....3....3....3....3....3....3....3....3....3
%K A189319 nonn
%O A189319 1,1
%A A189319 _R. H. Hardin_ Apr 20 2011