Number of partitions of 3 copies of n into distinct parts.

Terms

a(0) =1a(1) =1a(2) =4a(3) =5a(4) =13a(5) =18a(6) =37a(7) =56a(8) =103a(9) =154a(10) =279a(11) =398a(12) =682a(13) =1027a(14) =1664a(15) =2433a(16) =3977a(17) =5755a(18) =8957a(19) =13173a(20) =19980a(21) =29002a(22) =43894a(23) =62562a(24) =92531a(25) =133550a(26) =193348a(27) =274049a(28) =398218a(29) =558839