A323970 Number of 6 X n integer matrices (m_{i,j}) such that m_{1,1}=0, m_{6,n}=2, and all rows, columns, and falling diagonals are (weakly) monotonic without jumps of 2.

1, 10, 85, 632, 3423, 14795, 54219, 174844, 508484, 1357051, 3367166, 7846507, 17311702, 36401032, 73344164, 142259423, 266651159, 484610624, 856389171, 1475218962, 2482510921, 4088870385, 6602746625, 10468982846, 16320069070, 25043533065, 37869646820

Offset: 0

Author

Alois P. Heinz, Feb 09 2019

Keywords

• nonn
• easy

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..10000

Crossrefs

Row (or column) 6 of array in A323846.

Formula

G.f.: -(4*x^13 -47*x^12 +253*x^11 -822*x^10 +1788*x^9 -2728*x^8 +2958*x^7 -2253*x^6 +1145*x^5 -308*x^4 +21*x^3 +33*x^2 -3*x+1) / (x-1)^13.