Restricted partitions.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =2a(7) =4a(8) =7a(9) =13a(10) =24a(11) =43a(12) =78a(13) =141a(14) =253a(15) =455a(16) =818a(17) =1468a(18) =2637a(19) =4734a(20) =8495a(21) =15247a(22) =27361a(23) =49094a(24) =88093a(25) =158063a(26) =283599a(27) =508840a(28) =912956a(29) =1638003