Number of normal multisets that cannot be expressed as the multiset-union of a set of sets.

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =5a(5) =9a(6) =16a(7) =27a(8) =46a(9) =76a(10) =130a(11) =203a(12) =350a(13) =554a(14) =890a(15) =1474a(16) =2285a(17) =3732a(18) =5852a(19) =9297a(20) =14628a(21) =22936a(22) =35903a(23) =55893a(24) =86967a(25) =134585a(26) =207934a(27) =321122a(28) =492634a(29) =757490