Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.
A227163
Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =5a(1) =36a(2) =193a(3) =944a(4) =4528a(5) =20336a(6) =85018a(7) =330949a(8) =1200425a(9) =4071133a(10) =12971110a(11) =39024425a(12) =111413038a(13) =303209049a(14) =789787118a(15) =1975994532a(16) =4763501990a(17) =11094968344a(18) =25028901331a(19) =54804425836a(20) =116706101674a(21) =242125356042a(22) =490174804573
External references
- oeis: A227163