Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

A260362

Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.

Terms

    a(0) =48a(1) =127a(2) =912a(3) =4633a(4) =6144a(5) =38370a(6) =265120a(7) =551542a(8) =2092680a(9) =17786146a(10) =60491904a(11) =183202732a(12) =1313066840a(13) =6986822950a(14) =25056637336a(15) =145821754612

External references