Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

A260066

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000111.

Terms

    a(0) =557a(1) =1214a(2) =3825a(3) =7725a(4) =12664a(5) =34917a(6) =89948a(7) =166473a(8) =353678a(9) =964837a(10) =2132058a(11) =4168981a(12) =10127802a(13) =25093839a(14) =52249344a(15) =112937943a(16) =279024186a(17) =637020921a(18) =1344587610a(19) =3105334621a(20) =7406927290a(21) =16274194729a(22) =35781699436a(23) =84141524719

External references