Number of 3Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

A280401

Number of 3Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

Terms

    a(0) =0a(1) =14a(2) =66a(3) =238a(4) =769a(5) =2432a(6) =7440a(7) =22494a(8) =66934a(9) =197146a(10) =575042a(11) =1664510a(12) =4785950a(13) =13683634a(14) =38931434a(15) =110291246a(16) =311272806a(17) =875559938a(18) =2455439762a(19) =6867568958a(20) =19161061470a(21) =53342827474a(22) =148202912538a(23) =410993902254

External references