Number of 0..n arrays x(0..8) of 9 elements without any interior element greater than both neighbors or less than both neighbors.

A200877

Number of 0..n arrays x(0..8) of 9 elements without any interior element greater than both neighbors or less than both neighbors.

Terms

    a(0) =110a(1) =1523a(2) =9858a(3) =42479a(4) =141688a(5) =395929a(6) =971416a(7) =2156867a(8) =4424298a(9) =8509105a(10) =15512938a(11) =27033149a(12) =45322876a(13) =73486107a(14) =115712352a(15) =177555837a(16) =266264422a(17) =391163735a(18) =564102306a(19) =799963779a(20) =1117252576a(21) =1538759685a(22) =2092315544

External references