Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.

A266007

Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.

Terms

    a(0) =2a(1) =2a(2) =6a(3) =14a(4) =22a(5) =46a(6) =102a(7) =190a(8) =374a(9) =782a(10) =1542a(11) =3038a(12) =6166a(13) =12334a(14) =24486a(15) =49150a(16) =98486a(17) =196430a(18) =393030a(19) =786974a(20) =1572694a(21) =3144814a(22) =6292710a(23) =12583486a(24) =25162742a(25) =50333582a(26) =100667526a(27) =201318494a(28) =402652822a(29) =805322926

External references