Number of unique X-rays of n X n binary matrices with exactly n ones.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =8a(5) =13a(6) =21a(7) =31a(8) =45a(9) =65a(10) =92a(11) =127a(12) =175a(13) =237a(14) =318a(15) =425a(16) =561a(17) =735a(18) =959a(19) =1241a(20) =1597a(21) =2047a(22) =2607a(23) =3305a(24) =4174a(25) =5247a(26) =6569a(27) =8197a(28) =10189a(29) =12621