Number of ways of covering a 2n X 2n lattice by 2n^2 dominoes with exactly 4 horizontal (or vertical) dominoes.

A038758

Number of ways of covering a 2n X 2n lattice by 2n^2 dominoes with exactly 4 horizontal (or vertical) dominoes.

Terms

    a(0) =16a(1) =281a(2) =1785a(3) =7175a(4) =22015a(5) =56406a(6) =126966a(7) =259170a(8) =490050a(9) =871255a(10) =1472471a(11) =2385201a(12) =3726905a(13) =5645500a(14) =8324220a(15) =11986836a(16) =16903236a(17) =23395365a(18) =31843525a(19) =42693035a(20) =56461251a(21) =73744946a(22) =95228050a(23) =121689750a(24) =154012950a(25) =193193091

External references