Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

A260494

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

Terms

    a(0) =48a(1) =83a(2) =218a(3) =464a(4) =722a(5) =1600a(6) =3446a(7) =6277a(8) =12596a(9) =26271a(10) =51082a(11) =100763a(12) =204716a(13) =406841a(14) =804806a(15) =1614143a(16) =3223294a(17) =6404160a(18) =12784652a(19) =25529935a(20) =50847034a(21) =101384899a(22) =202319592a(23) =403339059a(24) =804133704a(25) =1603982398a(26) =3198547326a(27) =6377529472

External references