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

Terms

a(0) =1a(1) =2a(2) =4a(3) =14a(4) =53a(5) =180a(6) =656a(7) =2195a(8) =7250a(9) =23044a(10) =71123a(11) =213368a(12) =624425a(13) =1784399a(14) =4986210a(15) =13657266a(16) =36691985a(17) =96863639a(18) =251472815a(19) =642811767a(20) =1619203005a(21) =4022796235a(22) =9864987052a(23) =23894800443a(24) =57205375668a(25) =135438579331a(26) =317296680619