A259018 - cp's OEIS frontend

A259018 Lexicographically first permutation of the nonnegative integers such that Sum_{k=n..2n} a(k) is a square, starting with a(1)=0.

n	a(n)
1	0
2	1
3	2
4	6
5	3
6	5
7	4
8	7
9	8
10	9
11	10
12	21
13	11
14	30
15	12
16	13
17	14
18	16
19	15
20	18
21	17
22	19
23	20
24	50
25	22
26	32
27	23
28	60
29	24
30	45
31	25
32	28
33	26
34	75
35	27
36	34
37	29
38	36
39	31
40	35
41	33
42	38
43	37
44	92
45	39
46	100
47	40
48	43
49	41
50	74
51	42
52	47
53	44
54	57
55	46
56	48
57	49
58	84
59	51
60	52
61	53
62	90
63	54
64	55
65	56
66	58
67	93
68	59

[0, 1, 2, 6, 3, 5, 4, 7, 8, 9, 10, 21, 11, 30, 12, 13, 14, 16, 15, 18, 17, 19, 20, 50, 22, 32, 23, 60, 24, 45, 25, 28, 26, 75, 27, 34, 29, 36, 31, 35, 33, 38, 37, 92, 39, 100, 40, 43, 41, 74, 42, 47, 44, 57, 46, 48, 49, 84, 51, 52, 53, 90, 54, 55, 56, 58, 93, 59]

cp's OEIS Frontend

A259018 Lexicographically first permutation of the nonnegative integers such that Sum_{k=n..2n} a(k) is a square, starting with a(1)=0.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	6
5	3
6	5
7	4
8	7
9	8
10	9
11	10
12	21
13	11
14	30
15	12
16	13
17	14
18	16
19	15
20	18
21	17
22	19
23	20
24	50
25	22
26	32
27	23
28	60
29	24
30	45
31	25
32	28
33	26
34	75
35	27
36	34
37	29
38	36
39	31
40	35
41	33
42	38
43	37
44	92
45	39
46	100
47	40
48	43
49	41
50	74
51	42
52	47
53	44
54	57
55	46
56	48
57	49
58	84
59	51
60	52
61	53
62	90
63	54
64	55
65	56
66	58
67	93
68	59

n	a(n)
1	0
2	1
3	2
4	6
5	3
6	5
7	4
8	7
9	8
10	9
11	10
12	21
13	11
14	30
15	12
16	13
17	14
18	16
19	15
20	18
21	17
22	19
23	20
24	50
25	22
26	32
27	23
28	60
29	24
30	45
31	25
32	28
33	26
34	75
35	27
36	34
37	29
38	36
39	31
40	35
41	33
42	38
43	37
44	92
45	39
46	100
47	40
48	43
49	41
50	74
51	42
52	47
53	44
54	57
55	46
56	48
57	49
58	84
59	51
60	52
61	53
62	90
63	54
64	55
65	56
66	58
67	93
68	59

n	a(n)
1	0
2	1
3	2
4	6
5	3
6	5
7	4
8	7
9	8
10	9
11	10
12	21
13	11
14	30
15	12
16	13
17	14
18	16
19	15
20	18
21	17
22	19
23	20
24	50
25	22
26	32
27	23
28	60
29	24
30	45
31	25
32	28
33	26
34	75
35	27
36	34
37	29
38	36
39	31
40	35
41	33
42	38
43	37
44	92
45	39
46	100
47	40
48	43
49	41
50	74
51	42
52	47
53	44
54	57
55	46
56	48
57	49
58	84
59	51
60	52
61	53
62	90
63	54
64	55
65	56
66	58
67	93
68	59