Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

A261285

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101.

Terms

    a(0) =36a(1) =50a(2) =96a(3) =166a(4) =307a(5) =540a(6) =1015a(7) =1786a(8) =3304a(9) =5862a(10) =10877a(11) =19316a(12) =35609a(13) =63526a(14) =116992a(15) =209094a(16) =383787a(17) =687684a(18) =1260543a(19) =2262114a(20) =4138240a(21) =7439142a(22) =13591813a(23) =24462924a(24) =44638225a(25) =80433102a(26) =146628424a(27) =264446262a(28) =481653251a(29) =869371260

External references