Number of rectangular twice-partitions of n of type (P,R,P).

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =8a(5) =8a(6) =17a(7) =16a(8) =32a(9) =34a(10) =56a(11) =57a(12) =119a(13) =102a(14) =179a(15) =199a(16) =335a(17) =298a(18) =598a(19) =491a(20) =960a(21) =925a(22) =1441a(23) =1256a(24) =2966a(25) =2026a(26) =3726a(27) =3800a(28) =6488a(29) =4566