Total number of partitions of k*n into 3 parts for k = 1..n.

Terms

a(0) =0a(1) =1a(2) =11a(3) =39a(4) =114a(5) =273a(6) =571a(7) =1086a(8) =1925a(9) =3206a(10) =5101a(11) =7800a(12) =11533a(13) =16575a(14) =23252a(15) =31911a(16) =42987a(17) =56943a(18) =74304a(19) =95662a(20) =121682a(21) =153060a(22) =190614a(23) =235200a(24) =287758a(25) =349317a(26) =421001a(27) =503975a(28) =599560a(29) =709125