Number of nX3 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1s.

A297015

Number of nX3 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1s.

Terms

    a(0) =1a(1) =3a(2) =8a(3) =14a(4) =39a(5) =135a(6) =400a(7) =1310a(8) =4481a(9) =15005a(10) =50813a(11) =173538a(12) =590268a(13) =2009778a(14) =6857427a(15) =23374979a(16) =79672060a(17) =271719009a(18) =926494874a(19) =3158768148a(20) =10771237589a(21) =36728205113a(22) =125230802047a(23) =427013571111

External references