Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

A260840

Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Terms

    a(0) =2584a(1) =2976a(2) =6908a(3) =13170a(4) =16000a(5) =37882a(6) =80516a(7) =119194a(8) =231008a(9) =526102a(10) =890868a(11) =1551098a(12) =3444912a(13) =6540148a(14) =11105704a(15) =22909488a(16) =46468620a(17) =81665548a(18) =156797736a(19) =323324270a(20) =597713676a(21) =1104974160a(22) =2236199980a(23) =4307963032a(24) =7924411232

External references