Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

A260973

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101.

Terms

    a(0) =48a(1) =91a(2) =204a(3) =483a(4) =1146a(5) =2755a(6) =6526a(7) =15419a(8) =36518a(9) =86831a(10) =206258a(11) =489087a(12) =1159490a(13) =2751195a(14) =6530006a(15) =15494419a(16) =36755918a(17) =87199191a(18) =206899498a(19) =490917751a(20) =1164739402a(21) =2763371171a(22) =6556331950a(23) =15555736875a(24) =36907711926a(25) =87566685887

External references