Number of nX5 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280807
Number of nX5 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =0a(1) =72a(2) =1578a(3) =9715a(4) =41931a(5) =155560a(6) =521862a(7) =1635481a(8) =4878157a(9) =14014639a(10) =39104351a(11) =106631105a(12) =285454905a(13) =752759713a(14) =1960409283a(15) =5051884455a(16) =12901249792a(17) =32688874902a(18) =82257457021a(19) =205730877021a(20) =511748655573
External references
- oeis: A280807