Number of (n+2)X(n+2) binary arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
A184539
Number of (n+2)X(n+2) binary arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =45a(1) =193a(2) =631a(3) =1837a(4) =5313a(5) =16345a(6) =54543a(7) =194245a(8) =719905a(9) =2725367a(10) =10430675a(11) =40158073a(12) =155173369a(13) =601154073a(14) =2333701711a(15) =9075257125a(16) =35345417073a(17) =137846719279a(18) =538258108483
External references
- oeis: A184539