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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) 0

%I #3 Sep 11 2012 19:33:03

%S 1,1,1,1,1,1,2,2,5,11,25,51,136,367,886,2507,6986,20453,60708,172073,

%T 524771,1628140,5085497

%N 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 Column 4 of A216645

%e All solutions for n=9

%e ..3....1....1....1....1

%e ..3....3....2....1....1

%e ..4....3....3....2....1

%e ..5....5....4....2....2

%e ..6....6....5....4....5

%e ..7....6....6....5....7

%e ..7....6....7....6....8

%e ..8....8....8....9....8

%e ..8....9....9....9....8

%K nonn

%O 1,7

%A _R. H. Hardin_ Sep 11 2012

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)