Number of strings of numbers x(i=1..n) in 0..4 with sum i*x(i)^4 equal to n*256.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =13a(6) =33a(7) =113a(8) =433a(9) =2358a(10) =8535a(11) =28389a(12) =112039a(13) =427748a(14) =1769874a(15) =6610091a(16) =24128241a(17) =90190764a(18) =331582813a(19) =1222929244a(20) =4421062767a(21) =15812600521a(22) =56305580500a(23) =198730488338a(24) =696900040653