Number of 3-line partitions of n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =12a(5) =21a(6) =40a(7) =67a(8) =117a(9) =193a(10) =319a(11) =510a(12) =818a(13) =1274a(14) =1983a(15) =3032a(16) =4610a(17) =6915a(18) =10324a(19) =15235a(20) =22371a(21) =32554a(22) =47119a(23) =67689a(24) =96763a(25) =137404a(26) =194211a(27) =272939a(28) =381872a(29) =531576