Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4.

A197229

Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4.

Terms

    a(0) =1a(1) =7a(2) =12a(3) =31a(4) =79a(5) =186a(6) =465a(7) =1131a(8) =2776a(9) =6803a(10) =16663a(11) =40842a(12) =100065a(13) =245207a(14) =600844a(15) =1472287a(16) =3607663a(17) =8840098a(18) =21661545a(19) =53078827a(20) =130062864a(21) =318702387a(22) =780939327a(23) =1913591746a(24) =4689011265a(25) =11489821079a(26) =28154333788a(27) =68988586095a(28) =169047687279

External references