Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.

A297433

Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.

Terms

    a(0) =1a(1) =3a(2) =14a(3) =26a(4) =43a(5) =109a(6) =301a(7) =649a(8) =1332a(9) =3124a(10) =7545a(11) =16925a(12) =37301a(13) =85611a(14) =198538a(15) =450262a(16) =1014883a(17) =2315761a(18) =5303161a(19) =12062833a(20) =27380904a(21) =62381096a(22) =142295761a(23) =323928537a(24) =736878729a(25) =1678132851a(26) =3823284742a(27) =8705263890a(28) =19816325051a(29) =45124192277

External references