Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, west or southwest neighbors modulo 4 and the upper left element equal to 0.
A267344
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, west or southwest neighbors modulo 4 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =45a(5) =135a(6) =388a(7) =1220a(8) =5401a(9) =27146a(10) =125333a(11) =515897a(12) =2010472a(13) =8064508a(14) =34936670a(15) =159444254a(16) =725890833a(17) =3205348045a(18) =13816812300a(19) =59601118346a(20) =262631332138
External references
- oeis: A267344