T(n,k)=Half the number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.

A209796

T(n,k)=Half the number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference.

Terms

    a(0) =30a(1) =204a(2) =204a(3) =1380a(4) =3171a(5) =1380a(6) =9348a(7) =49056a(8) =49056a(9) =9348a(10) =63300a(11) =759642a(12) =1732554a(13) =759642a(14) =63300a(15) =428676a(16) =11761044a(17) =61289190a(18) =61289190a(19) =11761044a(20) =428676a(21) =2902980a(22) =182095128a(23) =2167312950a(24) =4953638163a(25) =2167312950a(26) =182095128a(27) =2902980a(28) =19659012

External references