Restricted partitions.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =4a(6) =7a(7) =13a(8) =24a(9) =42a(10) =76a(11) =137a(12) =245a(13) =441a(14) =792a(15) =1420a(16) =2550a(17) =4576a(18) =8209a(19) =14732a(20) =26433a(21) =47424a(22) =85092a(23) =152670a(24) =273914a(25) =491453a(26) =881744a(27) =1581985a(28) =2838333a(29) =5092398