A252824 - cp's OEIS frontend

A252824 Number of n X 4 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	8
2	53
3	340
4	1920
5	9075
6	36292
7	125892
8	387849
9	1082111
10	2777103
11	6637625
12	14922949
13	31813809
14	64737785
15	126429330
16	238046837
17	433778614
18	767506845
19	1322268502
20	2223460226
21	3656986483
22	5893853502
23	9323072932
24	14495166797
25	22179067861

[8, 53, 340, 1920, 9075, 36292, 125892, 387849, 1082111, 2777103, 6637625, 14922949, 31813809, 64737785, 126429330, 238046837, 433778614, 767506845, 1322268502, 2223460226, 3656986483, 5893853502, 9323072932, 14495166797, 22179067861]

cp's OEIS Frontend

A252824 Number of n X 4 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