Number of 4Xn 0..2 arrays with no element equal to any value at offset (-2,0) (-1,2) or (0,-2) and new values introduced in order 0..2.

A275567

Number of 4Xn 0..2 arrays with no element equal to any value at offset (-2,0) (-1,2) or (0,-2) and new values introduced in order 0..2.

Terms

    a(0) =6a(1) =216a(2) =504a(3) =1176a(4) =3192a(5) =8664a(6) =23712a(7) =64896a(8) =180960a(9) =504600a(10) =1418100a(11) =3985350a(12) =11202990a(13) =31492086a(14) =88441764a(15) =248378136a(16) =697381260a(17) =1958065350a(18) =5498516310a(19) =15440588646a(20) =43363859406a(21) =121784495766a(22) =342029032494a(23) =960580887846

External references