Number of partitions of n having no parts with multiplicity 3.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =5a(5) =6a(6) =9a(7) =12a(8) =19a(9) =24a(10) =34a(11) =43a(12) =62a(13) =77a(14) =105a(15) =132a(16) =177a(17) =220a(18) =287a(19) =356a(20) =462a(21) =570a(22) =723a(23) =888a(24) =1121a(25) =1370a(26) =1705a(27) =2074a(28) =2570a(29) =3111