cp's OEIS Frontend

A216642 Number of nondecreasing arrays of n 1..n integers with the sum of their 4th powers equal to sum(i^4,i=1..n).

%I A216642 #5 Jun 02 2025 08:08:05
%S A216642 1,1,1,1,1,1,2,2,5,11,25,51,136,367,886,2507,6986,20453,60708,172073,
%T A216642 524771,1628140,5085497
%N A216642 Number of nondecreasing arrays of n 1..n integers with the sum of their 4th powers equal to sum(i^4,i=1..n).
%C A216642 Column 4 of A216645
%e A216642 All solutions for n=9
%e A216642 ..3....1....1....1....1
%e A216642 ..3....3....2....1....1
%e A216642 ..4....3....3....2....1
%e A216642 ..5....5....4....2....2
%e A216642 ..6....6....5....4....5
%e A216642 ..7....6....6....5....7
%e A216642 ..7....6....7....6....8
%e A216642 ..8....8....8....9....8
%e A216642 ..8....9....9....9....8
%K A216642 nonn
%O A216642 1,7
%A A216642 _R. H. Hardin_ Sep 11 2012