Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

A261286

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

Terms

    a(0) =50a(1) =77a(2) =133a(3) =233a(4) =409a(5) =743a(6) =1361a(7) =2469a(8) =4485a(9) =8183a(10) =14901a(11) =27091a(12) =49293a(13) =89729a(14) =163277a(15) =297055a(16) =540549a(17) =983737a(18) =1790089a(19) =3257319a(20) =5927571a(21) =10786801a(22) =19628869a(23) =35719195a(24) =65000021a(25) =118283183a(26) =215243755a(27) =391687275a(28) =712769639a(29) =1297054417

External references