Number of partitions in all twice partitions of n where the first partition is strict.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =11a(5) =29a(6) =63a(7) =125a(8) =225a(9) =489a(10) =930a(11) =1704a(12) =3260a(13) =5859a(14) =10868a(15) =20026a(16) =35062a(17) =61660a(18) =111789a(19) =191119a(20) =337432a(21) =585847a(22) =1003876a(23) =1705380a(24) =2921394a(25) =4930357a(26) =8311554a(27) =14013583a(28) =23435178a(29) =38849655