Number of n X 2 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1s.

A296682

Number of n X 2 0..1 arrays with each 1 adjacent to 1, 2 or 3 king-move neighboring 1s.

Terms

    a(0) =2a(1) =12a(2) =43a(3) =145a(4) =524a(5) =1888a(6) =6737a(7) =24093a(8) =86250a(9) =308600a(10) =1104107a(11) =3950629a(12) =14135676a(13) =50578004a(14) =180970841a(15) =647524153a(16) =2316876914a(17) =8289912724a(18) =29661766587a(19) =106131439497a(20) =379744147900

External references