Number of length-rectangular twice-partitions of n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =10a(5) =14a(6) =26a(7) =35a(8) =60a(9) =82a(10) =131a(11) =177a(12) =286a(13) =376a(14) =582a(15) =793a(16) =1202a(17) =1610a(18) =2450a(19) =3274a(20) =4906a(21) =6665a(22) =9770a(23) =13274a(24) =19690a(25) =26506a(26) =38596a(27) =53006a(28) =76432a(29) =104189