Number of compositions (ordered partitions) of n into 2 or more distinct nonnegative parts.

Terms

a(0) =0a(1) =2a(2) =2a(3) =10a(4) =10a(5) =18a(6) =48a(7) =56a(8) =86a(9) =124a(10) =298a(11) =336a(12) =540a(13) =722a(14) =1070a(15) =2122a(16) =2614a(17) =3810a(18) =5316a(19) =7496a(20) =9986a(21) =18940a(22) =22558a(23) =33336a(24) =44568a(25) =63074a(26) =82034a(27) =114754a(28) =187642a(29) =234690