A252814 - cp's OEIS frontend

A252814 Number of n X 2 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	2
2	6
3	17
4	40
5	81
6	147
7	246
8	387
9	580
10	836
11	1167
12	1586
13	2107
14	2745
15	3516
16	4437
17	5526
18	6802
19	8285
20	9996
21	11957
22	14191
23	16722
24	19575
25	22776
26	26352
27	30331
28	34742
29	39615
30	44981
31	50872
32	57321
33	64362
34	72030
35	80361
36	89392
37	99161
38	109707
39	121070
40	133291

[2, 6, 17, 40, 81, 147, 246, 387, 580, 836, 1167, 1586, 2107, 2745, 3516, 4437, 5526, 6802, 8285, 9996, 11957, 14191, 16722, 19575, 22776, 26352, 30331, 34742, 39615, 44981, 50872, 57321, 64362, 72030, 80361, 89392, 99161, 109707, 121070, 133291]

cp's OEIS Frontend

A252814 Number of n X 2 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