A252822 - cp's OEIS frontend

A252822 Number of n X 2 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	2
2	6
3	18
4	53
5	142
6	339
7	729
8	1437
9	2638
10	4568
11	7536
12	11937
13	18266
14	27133
15	39279
16	55593
17	77130
18	105130
19	141038
20	186525
21	243510
22	314183
23	401029
24	506853
25	634806
26	788412
27	971596
28	1188713
29	1444578
30	1744497
31	2094299
32	2500369
33	2969682
34	3509838
35	4129098

[2, 6, 18, 53, 142, 339, 729, 1437, 2638, 4568, 7536, 11937, 18266, 27133, 39279, 55593, 77130, 105130, 141038, 186525, 243510, 314183, 401029, 506853, 634806, 788412, 971596, 1188713, 1444578, 1744497, 2094299, 2500369, 2969682, 3509838, 4129098]

cp's OEIS Frontend

A252822 Number of n X 2 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