Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.

A253154

Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.

Terms

    a(0) =69a(1) =88a(2) =94a(3) =129a(4) =201a(5) =345a(6) =633a(7) =1209a(8) =2361a(9) =4665a(10) =9273a(11) =18489a(12) =36921a(13) =73785a(14) =147513a(15) =294969a(16) =589881a(17) =1179705a(18) =2359353a(19) =4718649a(20) =9437241a(21) =18874425a(22) =37748793a(23) =75497529a(24) =150995001a(25) =301989945a(26) =603979833a(27) =1207959609a(28) =2415919161a(29) =4831838265

External references