Number of n X 2 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

A183314

Number of n X 2 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

Terms

    a(0) =3a(1) =6a(2) =13a(3) =27a(4) =57a(5) =119a(6) =250a(7) =523a(8) =1097a(9) =2297a(10) =4815a(11) =10086a(12) =21137a(13) =44283a(14) =92793a(15) =194419a(16) =407378a(17) =853559a(18) =1788481a(19) =3747361a(20) =7851867a(21) =16451910a(22) =34471669a(23) =72228171a(24) =151339401a(25) =317100335a(26) =664418698a(27) =1392152131a(28) =2916968489a(29) =6111905849

External references