Number of partitions of 3n into exactly 4 parts.

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =15a(5) =27a(6) =47a(7) =72a(8) =108a(9) =150a(10) =206a(11) =270a(12) =351a(13) =441a(14) =551a(15) =672a(16) =816a(17) =972a(18) =1154a(19) =1350a(20) =1575a(21) =1815a(22) =2087a(23) =2376a(24) =2700a(25) =3042a(26) =3422a(27) =3822a(28) =4263a(29) =4725