A125226 - cp's OEIS frontend

A125226 Array, read by antidiagonals, where A(1,1) = A(1,2) = A(2,1) = A(2,2) = 1, A(n,k) = 0 if n<1 or k<1, otherwise A(n,k) = A(n-2,k-2) + A(n-1,k-2) + A(n-2,k-1) + A(n-1,k-1).

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	0
8	2
9	2
10	0
11	0
12	1
13	4
14	1
15	0
16	0
17	0
18	4
19	4
20	0
21	0
22	0
23	0
24	3
25	9
26	3
27	0
28	0
29	0
30	0
31	1
32	11
33	11
34	1
35	0
36	0
37	0
38	0
39	0
40	8
41	21
42	8
43	0
44	0
45	0
46	0
47	0
48	0
49	4
50	27
51	27
52	4
53	0
54	0
55	0
56	0
57	0
58	0
59	1
60	23
61	52
62	23
63	1
64	0
65	0
66	0
67	0
68	0
69	0
70	0
71	13
72	67
73	67
74	13
75	0
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	5
84	62
85	127
86	62
87	5
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	0
96	1
97	41

[1, 1, 1, 0, 1, 0, 0, 2, 2, 0, 0, 1, 4, 1, 0, 0, 0, 4, 4, 0, 0, 0, 0, 3, 9, 3, 0, 0, 0, 0, 1, 11, 11, 1, 0, 0, 0, 0, 0, 8, 21, 8, 0, 0, 0, 0, 0, 0, 4, 27, 27, 4, 0, 0, 0, 0, 0, 0, 1, 23, 52, 23, 1, 0, 0, 0, 0, 0, 0, 0, 13, 67, 67, 13, 0, 0, 0, 0, 0, 0, 0, 0, 5, 62, 127, 62, 5, 0, 0, 0, 0, 0, 0, 0, 0, 1, 41]

cp's OEIS Frontend

A125226 Array, read by antidiagonals, where A(1,1) = A(1,2) = A(2,1) = A(2,2) = 1, A(n,k) = 0 if n<1 or k<1, otherwise A(n,k) = A(n-2,k-2) + A(n-1,k-2) + A(n-2,k-1) + A(n-1,k-1).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	0
8	2
9	2
10	0
11	0
12	1
13	4
14	1
15	0
16	0
17	0
18	4
19	4
20	0
21	0
22	0
23	0
24	3
25	9
26	3
27	0
28	0
29	0
30	0
31	1
32	11
33	11
34	1
35	0
36	0
37	0
38	0
39	0
40	8
41	21
42	8
43	0
44	0
45	0
46	0
47	0
48	0
49	4
50	27
51	27
52	4
53	0
54	0
55	0
56	0
57	0
58	0
59	1
60	23
61	52
62	23
63	1
64	0
65	0
66	0
67	0
68	0
69	0
70	0
71	13
72	67
73	67
74	13
75	0
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	5
84	62
85	127
86	62
87	5
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	0
96	1
97	41

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	0
8	2
9	2
10	0
11	0
12	1
13	4
14	1
15	0
16	0
17	0
18	4
19	4
20	0
21	0
22	0
23	0
24	3
25	9
26	3
27	0
28	0
29	0
30	0
31	1
32	11
33	11
34	1
35	0
36	0
37	0
38	0
39	0
40	8
41	21
42	8
43	0
44	0
45	0
46	0
47	0
48	0
49	4
50	27
51	27
52	4
53	0
54	0
55	0
56	0
57	0
58	0
59	1
60	23
61	52
62	23
63	1
64	0
65	0
66	0
67	0
68	0
69	0
70	0
71	13
72	67
73	67
74	13
75	0
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	5
84	62
85	127
86	62
87	5
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	0
96	1
97	41

n	a(n)
1	1
2	1
3	1
4	0
5	1
6	0
7	0
8	2
9	2
10	0
11	0
12	1
13	4
14	1
15	0
16	0
17	0
18	4
19	4
20	0
21	0
22	0
23	0
24	3
25	9
26	3
27	0
28	0
29	0
30	0
31	1
32	11
33	11
34	1
35	0
36	0
37	0
38	0
39	0
40	8
41	21
42	8
43	0
44	0
45	0
46	0
47	0
48	0
49	4
50	27
51	27
52	4
53	0
54	0
55	0
56	0
57	0
58	0
59	1
60	23
61	52
62	23
63	1
64	0
65	0
66	0
67	0
68	0
69	0
70	0
71	13
72	67
73	67
74	13
75	0
76	0
77	0
78	0
79	0
80	0
81	0
82	0
83	5
84	62
85	127
86	62
87	5
88	0
89	0
90	0
91	0
92	0
93	0
94	0
95	0
96	1
97	41