A252815 - cp's OEIS frontend

A252815 Number of n X 3 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	4
2	17
3	63
4	187
5	468
6	1032
7	2067
8	3840
9	6716
10	11179
11	17855
12	27537
13	41212
14	60090
15	85635
16	119598
17	164052
18	221429
19	294559
20	386711
21	501636
22	643612
23	817491
24	1028748
25	1283532
26	1588719
27	1951967
28	2381773
29	2887532
30	3479598
31	4169347
32	4969242
33	5892900
34	6955161

[4, 17, 63, 187, 468, 1032, 2067, 3840, 6716, 11179, 17855, 27537, 41212, 60090, 85635, 119598, 164052, 221429, 294559, 386711, 501636, 643612, 817491, 1028748, 1283532, 1588719, 1951967, 2381773, 2887532, 3479598, 4169347, 4969242, 5892900, 6955161]

cp's OEIS Frontend

A252815 Number of n X 3 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