Number of compositions of n into exactly two different parts with distinct multiplicities.

Terms

a(0) =3a(1) =10a(2) =12a(3) =38a(4) =56a(5) =79a(6) =152a(7) =251a(8) =284a(9) =594a(10) =920a(11) =1108a(12) =2136a(13) =3402a(14) =4407a(15) =8350a(16) =12863a(17) =17328a(18) =33218a(19) =52527a(20) =70074a(21) =133247a(22) =214551a(23) =294299a(24) =547360a(25) =883572a(26) =1234509a(27) =2284840a(28) =3667144a(29) =5219161