Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001.

A260290

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001.

Terms

    a(0) =560a(1) =1145a(2) =2966a(3) =5629a(4) =7146a(5) =19157a(6) =45596a(7) =64925a(8) =134780a(9) =364807a(10) =622726a(11) =1067272a(12) =2781546a(13) =5698332a(14) =9286764a(15) =21166601a(16) =48742256a(17) =84350681a(18) =166998638a(19) =396526090a(20) =759100312a(21) =1388416581a(22) =3155150616a(23) =6602029616a(24) =12006397572a(25) =25250015180

External references