Number of (n+2) X (4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.

A260763

Number of (n+2) X (4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011.

Terms

    a(0) =350a(1) =481a(2) =1234a(3) =2449a(4) =3328a(5) =7645a(6) =16095a(7) =25501a(8) =51049a(9) =109299a(10) =189890a(11) =355743a(12) =749522a(13) =1385493a(14) =2541076a(15) =5180564a(16) =9948565a(17) =18318480a(18) =36192443a(19) =70704397a(20) =131994545a(21) =255359264a(22) =500237231a(23) =947181697a(24) =1813491686a(25) =3537676433a(26) =6767673201a(27) =12919298500a(28) =25055524473a(29) =48207165149

External references