Number of strings of numbers x(i=1..n) in 0..5 with sum i^2*x(i)^2 equal to n^2*25.

A184236

Number of strings of numbers x(i=1..n) in 0..5 with sum i^2*x(i)^2 equal to n^2*25.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =15a(5) =24a(6) =213a(7) =356a(8) =2531a(9) =9710a(10) =46519a(11) =244683a(12) =891784a(13) =4720805a(14) =16462599a(15) =78516038a(16) =276022161a(17) =1161269082a(18) =4197268616a(19) =15926278724a(20) =58682897472a(21) =207708273846a(22) =766346150693

External references