Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111.

A260132

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111.

Terms

    a(0) =58a(1) =128a(2) =342a(3) =730a(4) =1626a(5) =3928a(6) =8998a(7) =20376a(8) =47424a(9) =109650a(10) =251290a(11) =579658a(12) =1338500a(13) =3080858a(14) =7097716a(15) =16367912a(16) =37715574a(17) =86898450a(18) =200293226a(19) =461601736a(20) =1063705902a(21) =2451421760a(22) =5649587496a(23) =13019565474a(24) =30004282786a(25) =69147284586

External references