Number of partitions of 3n into parts >= 3.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =17a(6) =33a(7) =60a(8) =110a(9) =191a(10) =331a(11) =556a(12) =927a(13) =1510a(14) =2438a(15) =3872a(16) =6095a(17) =9465a(18) =14578a(19) =22210a(20) =33581a(21) =50305a(22) =74831a(23) =110441a(24) =161955a(25) =235858a(26) =341474a(27) =491365a(28) =703263a(29) =1001014