A131421 - cp's OEIS frontend

A131421 Triangle read by rows (n>=1, 1<=k<=n): T(n,k) = 2*(n+k) - 3.

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

[1, 3, 5, 5, 7, 9, 7, 9, 11, 13, 9, 11, 13, 15, 17, 11, 13, 15, 17, 19, 21, 13, 15, 17, 19, 21, 23, 25, 15, 17, 19, 21, 23, 25, 27, 29, 17, 19, 21, 23, 25, 27, 29, 31, 33, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41]

cp's OEIS Frontend

A131421 Triangle read by rows (n>=1, 1<=k<=n): T(n,k) = 2*(n+k) - 3.

Table of values

List of values

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

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

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