Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =16a(5) =33a(6) =62a(7) =111a(8) =192a(9) =325a(10) =542a(11) =895a(12) =1468a(13) =2397a(14) =3902a(15) =6339a(16) =10284a(17) =16669a(18) =27002a(19) =43723a(20) =70780a(21) =114561a(22) =185402a(23) =300027a(24) =485496a(25) =785593a(26) =1271162a(27) =2056831a(28) =3328072a(29) =5384985