Number of twice-partitions of n into partitions with all different lengths.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =15a(6) =31a(7) =53a(8) =105a(9) =178a(10) =330a(11) =555a(12) =1024a(13) =1693a(14) =2991a(15) =5014a(16) =8651a(17) =14242a(18) =24477a(19) =39864a(20) =67078a(21) =109499a(22) =181311a(23) =292764a(24) =483775a(25) =774414a(26) =1260016a(27) =2016427a(28) =3254327a(29) =5162407