Number of partitions of [n] into blocks whose element sum is <= n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =12a(7) =26a(8) =57a(9) =141a(10) =333a(11) =885a(12) =2259a(13) =6391a(14) =17302a(15) =51685a(16) =147937a(17) =460561a(18) =1389093a(19) =4504136a(20) =14127767a(21) =47719998a(22) =155559696a(23) =542178148a(24) =1835105103a(25) =6600158865a(26) =23035501468a(27) =85428655084a(28) =307266398440