Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or west neighbors modulo 4 and the upper left element equal to 0.
A268120
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or west neighbors modulo 4 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =25a(4) =182a(5) =1256a(6) =7396a(7) =39891a(8) =210384a(9) =1168317a(10) =7080023a(11) =45942141a(12) =304138329a(13) =1984289501a(14) =12627984625a(15) =79001714951a(16) =493690545161
External references
- oeis: A268120