a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,0,1,0.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =2a(7) =4a(8) =10a(9) =24a(10) =56a(11) =133a(12) =318a(13) =760a(14) =1822a(15) =4384a(16) =10576a(17) =25578a(18) =62020a(19) =150744a(20) =367220a(21) =896496a(22) =2193104a(23) =5375405a(24) =13199606a(25) =32468912a(26) =80000438a(27) =197423104a(28) =487921440a(29) =1207578750