Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, west or northeast neighbors modulo 4 and the upper left element equal to 0.
A267397
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, west or northeast neighbors modulo 4 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =12a(4) =36a(5) =127a(6) =491a(7) =1975a(8) =7870a(9) =31298a(10) =124276a(11) =500855a(12) =2061014a(13) =8699937a(14) =37534533a(15) =164436255a(16) =725855629a(17) =3210406564a(18) =14185263492a(19) =62597467436a(20) =276260201275
External references
- oeis: A267397