A143997 - cp's OEIS frontend

A143997 Rectangular array by antidiagonals: label each unit square in the first quadrant lattice by its northeast vertex (x,y) and mark squares for which (x,y) is congruent mod 4 to one of the following: (1,4), (2,2), (3,3), (4,1); then R(m,n) is the number of UNmarked squares in the rectangle [0,m]x[0,n].

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

[1, 2, 2, 3, 3, 3, 3, 5, 5, 3, 4, 6, 7, 6, 4, 5, 8, 9, 9, 8, 5, 6, 9, 12, 12, 12, 9, 6, 6, 11, 14, 15, 15, 14, 11, 6, 7, 12, 16, 18, 19, 18, 16, 12, 7, 8, 14, 18, 21, 23, 23, 21, 18, 14, 8, 9, 15, 21, 24, 27, 27, 27, 24, 21, 15, 9, 9, 17, 23, 27, 30, 32, 32, 30, 27, 23, 17, 9, 10, 18, 25]

cp's OEIS Frontend

Table of values

List of values

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

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

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