Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

A305335

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =5a(2) =12a(3) =26a(4) =62a(5) =166a(6) =431a(7) =1091a(8) =2812a(9) =7268a(10) =18741a(11) =48294a(12) =124560a(13) =321313a(14) =828693a(15) =2137285a(16) =5512541a(17) =14218105a(18) =36671374a(19) =94583059a(20) =243949927a(21) =629198761a(22) =1622836684a(23) =4185639740a(24) =10795653340a(25) =27844280385a(26) =71816305058a(27) =185229485865

External references