Number of nX4 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.
A266021
Number of nX4 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.
Terms
- a(0) =5a(1) =42a(2) =91a(3) =577a(4) =3796a(5) =19688a(6) =110924a(7) =656555a(8) =3732300a(9) =21344656a(10) =123330565a(11) =708246405a(12) =4066193034a(13) =23408646708a(14) =134627655119a(15) =773992993358
External references
- oeis: A266021