Number of (n+1)X7 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A186479

Number of (n+1)X7 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =5955a(1) =8223a(2) =21760a(3) =67714a(4) =108025a(5) =305089a(6) =418177a(7) =1286113a(8) =1812049a(9) =5368065a(10) =8100785a(11) =22640045a(12) =36286649a(13) =96020681a(14) =161275017a(15) =408409609a(16) =713044957a(17) =1742523169a(18) =3140266657a(19) =7453942513a(20) =13786320241a(21) =31954929709a(22) =60372875257

External references