Number of n X 3 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

A224153

Number of n X 3 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

Terms

    a(0) =7a(1) =28a(2) =89a(3) =281a(4) =900a(5) =2935a(6) =9681a(7) =32020a(8) =105937a(9) =350311a(10) =1157860a(11) =3826287a(12) =12643725a(13) =41780500a(14) =138063433a(15) =456233915a(16) =1507641652a(17) =4982061047a(18) =16463412165a(19) =54403960596a(20) =179779885769a(21) =594089193379

External references