Number of refinement-ordered pairs of strict integer partitions of n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =9a(7) =12a(8) =16a(9) =24a(10) =37a(11) =47a(12) =68a(13) =90a(14) =123a(15) =180a(16) =228a(17) =307a(18) =408a(19) =540a(20) =694a(21) =970a(22) =1207a(23) =1598a(24) =2048a(25) =2669a(26) =3357a(27) =4382a(28) =5599a(29) =7109