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

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =2a(7) =1a(8) =2a(9) =6a(10) =6a(11) =7a(12) =20a(13) =30a(14) =34a(15) =75a(16) =140a(17) =182a(18) =322a(19) =644a(20) =972a(21) =1554a(22) =3024a(23) =5091a(24) =8052a(25) =14784a(26) =26378a(27) =43032a(28) =75504a(29) =136994