A252821 - cp's OEIS frontend

A252821 Number of n X n nonnegative integer arrays with upper left 0 and every value within 3 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	81
4	1920
5	54376
6	1679072
7	55960651
8	2001017650
9	76084625352
10	3047083917080
11	127445868976818
12	5528160760257164
13	247294135503496534
14	11357522219262644466
15	533619846702969331737
16	25573797311727396663076

[1, 6, 81, 1920, 54376, 1679072, 55960651, 2001017650, 76084625352, 3047083917080, 127445868976818, 5528160760257164, 247294135503496534, 11357522219262644466, 533619846702969331737, 25573797311727396663076]

cp's OEIS Frontend

A252821 Number of n X n nonnegative integer arrays with upper left 0 and every value within 3 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