Number of n X 4 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

A281201

Number of n X 4 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =2a(1) =28a(2) =98a(3) =270a(4) =676a(5) =1588a(6) =3604a(7) =7960a(8) =17254a(9) =36848a(10) =77776a(11) =162610a(12) =337292a(13) =694982a(14) =1423852a(15) =2902806a(16) =5892558a(17) =11916410a(18) =24017514a(19) =48262212a(20) =96719706a(21) =193358890a(22) =385702166a(23) =767826768a(24) =1525708160a(25) =3026506470a(26) =5994196442a(27) =11854696726

External references