Number of multisets summing to n not equal to the first sums of any nonempty multiset.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =11a(7) =16a(8) =23a(9) =34a(10) =45a(11) =62a(12) =84a(13) =115a(14) =150a(15) =199a(16) =259a(17) =340a(18) =436a(19) =562a(20) =715a(21) =912a(22) =1148a(23) =1448a(24) =1811a(25) =2265a(26) =2809a(27) =3486a(28) =4296a(29) =5292