A269845 - cp's OEIS frontend

A269845 Irregular triangle read by rows: T(n,k) = (k/2+1/2)^2 if odd-k otherwise T(n,k) = (n-k/2)^2 where n >= 1, k = 0..2*n-1.

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	9
8	1
9	4
10	4
11	1
12	9
13	16
14	1
15	9
16	4
17	4
18	9
19	1
20	16
21	25
22	1
23	16
24	4
25	9
26	9
27	4
28	16
29	1
30	25
31	36
32	1
33	25
34	4
35	16
36	9
37	9
38	16
39	4
40	25
41	1
42	36
43	49
44	1
45	36
46	4
47	25
48	9
49	16
50	16
51	9
52	25
53	4
54	36
55	1
56	49
57	64
58	1
59	49
60	4
61	36
62	9
63	25
64	16
65	16
66	25
67	9
68	36
69	4
70	49
71	1
72	64
73	81
74	1
75	64
76	4
77	49
78	9
79	36
80	16
81	25
82	25
83	16
84	36
85	9
86	49
87	4
88	64
89	1
90	81
91	100
92	1
93	81
94	4
95	64
96	9
97	49
98	16
99	36
100	25
101	25
102	36
103	16
104	49

[1, 1, 4, 1, 1, 4, 9, 1, 4, 4, 1, 9, 16, 1, 9, 4, 4, 9, 1, 16, 25, 1, 16, 4, 9, 9, 4, 16, 1, 25, 36, 1, 25, 4, 16, 9, 9, 16, 4, 25, 1, 36, 49, 1, 36, 4, 25, 9, 16, 16, 9, 25, 4, 36, 1, 49, 64, 1, 49, 4, 36, 9, 25, 16, 16, 25, 9, 36, 4, 49, 1, 64, 81, 1, 64, 4, 49, 9, 36, 16, 25, 25, 16, 36, 9, 49, 4, 64, 1, 81, 100, 1, 81, 4, 64, 9, 49, 16, 36, 25, 25, 36, 16, 49]

cp's OEIS Frontend

A269845 Irregular triangle read by rows: T(n,k) = (k/2+1/2)^2 if odd-k otherwise T(n,k) = (n-k/2)^2 where n >= 1, k = 0..2*n-1.

Table of values

List of values

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	9
8	1
9	4
10	4
11	1
12	9
13	16
14	1
15	9
16	4
17	4
18	9
19	1
20	16
21	25
22	1
23	16
24	4
25	9
26	9
27	4
28	16
29	1
30	25
31	36
32	1
33	25
34	4
35	16
36	9
37	9
38	16
39	4
40	25
41	1
42	36
43	49
44	1
45	36
46	4
47	25
48	9
49	16
50	16
51	9
52	25
53	4
54	36
55	1
56	49
57	64
58	1
59	49
60	4
61	36
62	9
63	25
64	16
65	16
66	25
67	9
68	36
69	4
70	49
71	1
72	64
73	81
74	1
75	64
76	4
77	49
78	9
79	36
80	16
81	25
82	25
83	16
84	36
85	9
86	49
87	4
88	64
89	1
90	81
91	100
92	1
93	81
94	4
95	64
96	9
97	49
98	16
99	36
100	25
101	25
102	36
103	16
104	49

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	9
8	1
9	4
10	4
11	1
12	9
13	16
14	1
15	9
16	4
17	4
18	9
19	1
20	16
21	25
22	1
23	16
24	4
25	9
26	9
27	4
28	16
29	1
30	25
31	36
32	1
33	25
34	4
35	16
36	9
37	9
38	16
39	4
40	25
41	1
42	36
43	49
44	1
45	36
46	4
47	25
48	9
49	16
50	16
51	9
52	25
53	4
54	36
55	1
56	49
57	64
58	1
59	49
60	4
61	36
62	9
63	25
64	16
65	16
66	25
67	9
68	36
69	4
70	49
71	1
72	64
73	81
74	1
75	64
76	4
77	49
78	9
79	36
80	16
81	25
82	25
83	16
84	36
85	9
86	49
87	4
88	64
89	1
90	81
91	100
92	1
93	81
94	4
95	64
96	9
97	49
98	16
99	36
100	25
101	25
102	36
103	16
104	49

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	9
8	1
9	4
10	4
11	1
12	9
13	16
14	1
15	9
16	4
17	4
18	9
19	1
20	16
21	25
22	1
23	16
24	4
25	9
26	9
27	4
28	16
29	1
30	25
31	36
32	1
33	25
34	4
35	16
36	9
37	9
38	16
39	4
40	25
41	1
42	36
43	49
44	1
45	36
46	4
47	25
48	9
49	16
50	16
51	9
52	25
53	4
54	36
55	1
56	49
57	64
58	1
59	49
60	4
61	36
62	9
63	25
64	16
65	16
66	25
67	9
68	36
69	4
70	49
71	1
72	64
73	81
74	1
75	64
76	4
77	49
78	9
79	36
80	16
81	25
82	25
83	16
84	36
85	9
86	49
87	4
88	64
89	1
90	81
91	100
92	1
93	81
94	4
95	64
96	9
97	49
98	16
99	36
100	25
101	25
102	36
103	16
104	49