T(n,k)=Number of nXk binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.
A268740
T(n,k)=Number of nXk binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =2a(6) =5a(7) =15a(8) =15a(9) =5a(10) =10a(11) =48a(12) =80a(13) =48a(14) =10a(15) =20a(16) =145a(17) =396a(18) =396a(19) =145a(20) =20a(21) =38a(22) =420a(23) =1788a(24) =2876a(25) =1788a(26) =420a(27) =38a(28) =71a(29) =1183
External references
- oeis: A268740