T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.
A271246
T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =27a(9) =0a(10) =0a(11) =0a(12) =64a(13) =3969a(14) =0a(15) =0a(16) =0a(17) =76a(18) =19200a(19) =900963a(20) =0a(21) =0a(22) =0a(23) =77a(24) =33672a(25) =9523200a(26) =401227533a(27) =0a(28) =0a(29) =0
External references
- oeis: A271246