A252813 - cp's OEIS frontend

A252813 Number of n X n nonnegative integer arrays with upper left 0 and every value within 2 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.

n	a(n)
1	1
2	6
3	63
4	684
5	7564
6	86724
7	1033761
8	12755742
9	161986236
10	2106102800
11	27918827562
12	376114207132
13	5136290930902
14	70961672284626
15	990271326335611
16	13940676825684808
17	197768062909075426
18	2824828311338844486

[1, 6, 63, 684, 7564, 86724, 1033761, 12755742, 161986236, 2106102800, 27918827562, 376114207132, 5136290930902, 70961672284626, 990271326335611, 13940676825684808, 197768062909075426, 2824828311338844486]

cp's OEIS Frontend

A252813 Number of n X n nonnegative integer arrays with upper left 0 and every value within 2 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.

Table of values

List of values