Number of nX4 (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X5 binary array with rows and columns of the latter in lexicographically nondecreasing order.
A226868
Number of nX4 (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X5 binary array with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =11a(1) =91a(2) =792a(3) =6195a(4) =41222a(5) =235528a(6) =1179663a(7) =5279390a(8) =21450391a(9) =80163310a(10) =278497578a(11) =907289100a(12) =2791617118a(13) =8160858953a(14) =22780131186a(15) =60975863607a(16) =157078679556a(17) =390656580964a(18) =940538345174
External references
- oeis: A226868