A278987 - cp's OEIS frontend

A278987 Array read by antidiagonals downwards: T(b,n) = number of words of length n over an alphabet of size b that are in standard order and which have the property that every letter that appears in the word is repeated.

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	0
7	1
8	1
9	1
10	0
11	1
12	4
13	1
14	1
15	0
16	1
17	11
18	4
19	1
20	1
21	0
22	1
23	26
24	11
25	4
26	1
27	1
28	0
29	1
30	57
31	41
32	11
33	4
34	1
35	1
36	0
37	1
38	120
39	162
40	41
41	11
42	4
43	1
44	1
45	0
46	1
47	247
48	610
49	162
50	41
51	11
52	4
53	1
54	1
55	0
56	1
57	502
58	2165
59	715
60	162
61	41
62	11
63	4
64	1
65	1
66	0
67	1
68	1013
69	7327
70	3425
71	715
72	162
73	41
74	11
75	4
76	1
77	1
78	0

[0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 4, 1, 1, 0, 1, 11, 4, 1, 1, 0, 1, 26, 11, 4, 1, 1, 0, 1, 57, 41, 11, 4, 1, 1, 0, 1, 120, 162, 41, 11, 4, 1, 1, 0, 1, 247, 610, 162, 41, 11, 4, 1, 1, 0, 1, 502, 2165, 715, 162, 41, 11, 4, 1, 1, 0, 1, 1013, 7327, 3425, 715, 162, 41, 11, 4, 1, 1, 0]

cp's OEIS Frontend

A278987 Array read by antidiagonals downwards: T(b,n) = number of words of length n over an alphabet of size b that are in standard order and which have the property that every letter that appears in the word is repeated.

Table of values

List of values