Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors not equal to itself.

A265987

Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors not equal to itself.

Terms

    a(0) =2a(1) =2a(2) =6a(3) =10a(4) =30a(5) =66a(6) =182a(7) =442a(8) =1166a(9) =2930a(10) =7590a(11) =19306a(12) =49662a(13) =126882a(14) =325526a(15) =833050a(16) =2135150a(17) =5467346a(18) =14007942a(19) =35877322a(20) =91909086a(21) =235418370a(22) =603054710a(23) =1544728186a(24) =3956947022a(25) =10135859762a(26) =25963647846a(27) =66507086890a(28) =170361678270

External references