Number of (n+4)X5 binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s.

A183458

Number of (n+4)X5 binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =21a(6) =40a(7) =60a(8) =344a(9) =706a(10) =1115a(11) =5961a(12) =12955a(13) =21430a(14) =105338a(15) =240405a(16) =415187a(17) =1882817a(18) =4477153a(19) =8046028a(20) =33915664a(21) =83437560a(22) =155547810a(23) =614501063a(24) =1554456963a(25) =2997410782a(26) =11186285623a(27) =28942766933a(28) =57570735736a(29) =204441596636

External references