Number of partitions of n into distinct parts with 2 levels of parentheses.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =7a(5) =14a(6) =29a(7) =57a(8) =110a(9) =217a(10) =417a(11) =794a(12) =1513a(13) =2860a(14) =5373a(15) =10063a(16) =18740a(17) =34750a(18) =64221a(19) =118199a(20) =216775a(21) =396297a(22) =722136a(23) =1311888a(24) =2376575a(25) =4293407a(26) =7735941a(27) =13903985a(28) =24929763a(29) =44595606