Number of n X 3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 neighboring 1.

A296315

Number of n X 3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 neighboring 1.

Terms

    a(0) =3a(1) =11a(2) =32a(3) =96a(4) =295a(5) =902a(6) =2747a(7) =8380a(8) =25577a(9) =78021a(10) =238029a(11) =726211a(12) =2215568a(13) =6759403a(14) =20622067a(15) =62915288a(16) =191946374a(17) =585603549a(18) =1786600798a(19) =5450687951a(20) =16629344149a(21) =50733978916a(22) =154782809780a(23) =472222339285

External references