Number of partitions of n into parts of 3 kinds.

Terms

a(0) =1a(1) =3a(2) =9a(3) =22a(4) =51a(5) =108a(6) =221a(7) =429a(8) =810a(9) =1479a(10) =2640a(11) =4599a(12) =7868a(13) =13209a(14) =21843a(15) =35581a(16) =57222a(17) =90882a(18) =142769a(19) =221910a(20) =341649a(21) =521196a(22) =788460a(23) =1183221a(24) =1762462a(25) =2606604a(26) =3829437a(27) =5590110a(28) =8111346a(29) =11701998