Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302624

Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =25a(2) =25a(3) =45a(4) =79a(5) =146a(6) =286a(7) =563a(8) =1114a(9) =2222a(10) =4435a(11) =8858a(12) =17710a(13) =35411a(14) =70810a(15) =141614a(16) =283219a(17) =566426a(18) =1132846a(19) =2265683a(20) =4531354a(21) =9062702a(22) =18125395a(23) =36250778a(24) =72501550a(25) =145003091a(26) =290006170a(27) =580012334a(28) =1160024659a(29) =2320049306

External references