cp's OEIS Frontend

A377066 Number of 4 X n 0..2 matrices with row sums n and column sums 4 up to permutations of rows.

%I A377066 #7 Oct 15 2024 15:46:59
%S A377066 1,1,3,12,117,1421,20326,307063,4809897,77098437,1257981093,
%T A377066 20817768368,348552520988,5893520355308,100492937876761,
%U A377066 1726068011602392,29836176505279377,518637160845827153,9060385447950862705,158987518980922356784,2801031979220628009327
%N A377066 Number of 4 X n 0..2 matrices with row sums n and column sums 4 up to permutations of rows.
%C A377066 Also, the number of 4 X n {-1,0,1} matrices with all rows and columns summing to zero up to permutations of rows.
%e A377066 The a(2) = 3 matrices are:
%e A377066    [1 1]   [2 0]   [2 0]
%e A377066    [1 1]   [1 1]   [2 0]
%e A377066    [1 1]   [1 1]   [0 2]
%e A377066    [1 1]   [0 2]   [0 2]
%Y A377066 Row n=4 of A377063.
%Y A377066 Cf. A172642, A377065, A377068.
%K A377066 nonn
%O A377066 0,3
%A A377066 _Andrew Howroyd_, Oct 15 2024