Number of strings of numbers x(i=1..n) in 0..4 with Sum_{i=1..n} i^2*x(i)^3 = n^2*64.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =5a(7) =16a(8) =68a(9) =244a(10) =1106a(11) =4041a(12) =15802a(13) =60716a(14) =234319a(15) =885466a(16) =3369738a(17) =12612488a(18) =47251424a(19) =174691216a(20) =644760884a(21) =2353213266a(22) =8557977690a(23) =30825999521a(24) =110546795278a(25) =393117952349