Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.

A253006

Number of n X 3 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =54a(5) =632a(6) =2902a(7) =8416a(8) =18770a(9) =35564a(10) =60398a(11) =94872a(12) =140586a(13) =199140a(14) =272134a(15) =361168a(16) =467842a(17) =593756a(18) =740510a(19) =909704a(20) =1102938a(21) =1321812a(22) =1567926a(23) =1842880a(24) =2148274a(25) =2485708a(26) =2856782a(27) =3263096a(28) =3706250a(29) =4187844

External references