Number of strings of numbers x(i=1..n) in 0..2 with sum i*x(i)^4 equal to n*16.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =7a(6) =13a(7) =25a(8) =54a(9) =122a(10) =253a(11) =558a(12) =1199a(13) =2596a(14) =5619a(15) =12049a(16) =25695a(17) =54733a(18) =115830a(19) =244106a(20) =512444a(21) =1070965a(22) =2229313a(23) =4622382a(24) =9546244a(25) =19639568a(26) =40254273a(27) =82200330a(28) =167244370a(29) =339055002