login
A323971
Number of 7 X n integer matrices (m_{i,j}) such that m_{1,1}=0, m_{7,n}=2, and all rows, columns, and falling diagonals are (weakly) monotonic without jumps of 2.
2
1, 15, 155, 1332, 8342, 41586, 174844, 642815, 2117690, 6362806, 17671203, 45844681, 112047610, 259796057, 574776968, 1219349012, 2490738686, 4916477305, 9406990883, 17494038498, 31695618318, 56063910644, 96993880940, 164397619093, 273384891666, 446635565576
OFFSET
0,2
LINKS
FORMULA
G.f.: -(5*x^15 -69*x^14 +443*x^13 -1750*x^12 +4744*x^11 -9317*x^10 +13630*x^9 -15026*x^8 +12430*x^7-7561*x^6 +3263*x^5-823*x^4 +127*x^3 +35*x^2+1) / (x-1)^15.
CROSSREFS
Row (or column) 7 of array in A323846.
Sequence in context: A157380 A098685 A223995 * A006096 A346843 A341918
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Feb 09 2019
STATUS
approved