Number of corners, or planar partitions of n with only one row and one column.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =12a(5) =21a(6) =38a(7) =63a(8) =106a(9) =170a(10) =272a(11) =422a(12) =653a(13) =986a(14) =1482a(15) =2191a(16) =3218a(17) =4666a(18) =6726a(19) =9592a(20) =13602a(21) =19122a(22) =26733a(23) =37102a(24) =51232a(25) =70292a(26) =95989a(27) =130356a(28) =176246a(29) =237120