Number of strings of numbers x(i=1..7) in 0..n with sum i*x(i)^4 equal to 7*n^4.

Terms

a(0) =5a(1) =13a(2) =17a(3) =33a(4) =33a(5) =76a(6) =76a(7) =137a(8) =138a(9) =196a(10) =240a(11) =398a(12) =287a(13) =495a(14) =460a(15) =765a(16) =720a(17) =968a(18) =957a(19) =1160a(20) =1261a(21) =1706a(22) =1629a(23) =2183a(24) =1777a(25) =2655a(26) =2562a(27) =3371a(28) =3159a(29) =3228