A181521 - cp's OEIS frontend

A181521 Representation of n = sum_k b_k*(k!!) in the double-factorial base by some b_k-fold concatenation of the indices k.

n	a(n)
1	1
2	2
3	3
4	13
5	23
6	33
7	133
8	4
9	14
10	24
11	34
12	134
13	234
14	334
15	5
16	15
17	25
18	35
19	135
20	235
21	335
22	1335
23	45
24	145
25	245
26	345
27	1345
28	2345
29	3345
30	55
31	155
32	255
33	355
34	1355
35	2355
36	3355
37	13355
38	455
39	1455
40	2455
41	3455
42	13455
43	23455
44	33455
45	555
46	1555
47	2555
48	6
49	16
50	26
51	36
52	136
53	236
54	336

[1, 2, 3, 13, 23, 33, 133, 4, 14, 24, 34, 134, 234, 334, 5, 15, 25, 35, 135, 235, 335, 1335, 45, 145, 245, 345, 1345, 2345, 3345, 55, 155, 255, 355, 1355, 2355, 3355, 13355, 455, 1455, 2455, 3455, 13455, 23455, 33455, 555, 1555, 2555, 6, 16, 26, 36, 136, 236, 336]

cp's OEIS Frontend

A181521 Representation of n = sum_k b_k*(k!!) in the double-factorial base by some b_k-fold concatenation of the indices k.

Table of values

List of values