Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.

A259995

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.

Terms

    a(0) =99a(1) =269a(2) =805a(3) =1819a(4) =4383a(5) =12412a(6) =32525a(7) =82616a(8) =222474a(9) =598599a(10) =1577548a(11) =4210492a(12) =11316402a(13) =30215951a(14) =80758149a(15) =216596656a(16) =580222858a(17) =1553421000a(18) =4163544562a(19) =11159591352a(20) =29901049773a(21) =80136519668a(22) =214797758849a(23) =575682349029

External references