A257798 - cp's OEIS frontend

A257798 Permutation of natural numbers: a(1) = 1; a(2n) = nontriangular(a(n)), a(2n+1) = triangular(1+a(n)), where triangular = A000217, nontriangular = A014132.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	5
7	10
8	7
9	15
10	9
11	28
12	8
13	21
14	14
15	66
16	11
17	36
18	20
19	136
20	13
21	55
22	35
23	435
24	12
25	45
26	27
27	253
28	19
29	120
30	77
31	2278
32	16
33	78
34	44
35	703
36	26
37	231
38	152
39	9453
40	18
41	105
42	65
43	1596
44	43
45	666
46	464
47	95266
48	17
49	91
50	54
51	1081
52	34
53	406
54	275
55	32385
56	25
57	210
58	135
59	7381
60	89
61	3081
62	2345
63	2598060
64	22
65	153
66	90
67	3160
68	53
69	1035
70	740
71	248160
72	33

[1, 2, 3, 4, 6, 5, 10, 7, 15, 9, 28, 8, 21, 14, 66, 11, 36, 20, 136, 13, 55, 35, 435, 12, 45, 27, 253, 19, 120, 77, 2278, 16, 78, 44, 703, 26, 231, 152, 9453, 18, 105, 65, 1596, 43, 666, 464, 95266, 17, 91, 54, 1081, 34, 406, 275, 32385, 25, 210, 135, 7381, 89, 3081, 2345, 2598060, 22, 153, 90, 3160, 53, 1035, 740, 248160, 33]

cp's OEIS Frontend

A257798 Permutation of natural numbers: a(1) = 1; a(2n) = nontriangular(a(n)), a(2n+1) = triangular(1+a(n)), where triangular = A000217, nontriangular = A014132.

Table of values

List of values