Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

A281051

Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =6a(2) =68a(3) =376a(4) =1492a(5) =4988a(6) =15028a(7) =42252a(8) =113076a(9) =291660a(10) =731060a(11) =1791052a(12) =4306868a(13) =10197068a(14) =23828404a(15) =55060556a(16) =125999028a(17) =285894732a(18) =643864500a(19) =1440442444a(20) =3203438516a(21) =7086237772a(22) =15599703988a(23) =34190878796a(24) =74638727092a(25) =162339448908

External references