A213027 - cp's OEIS frontend

A213027 Number A(n,k) of 3n-length k-ary words, either empty or beginning with the first letter of the alphabet, that can be built by repeatedly inserting triples of identical letters into the initially empty word; square array A(n,k), n>=0, k>=0, by antidiagonals.

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	0
6	1
7	1
8	1
9	0
10	1
11	1
12	4
13	1
14	0
15	1
16	1
17	7
18	19
19	1
20	0
21	1
22	1
23	10
24	61
25	98
26	1
27	0
28	1
29	1
30	13
31	127
32	591
33	531
34	1
35	0
36	1
37	1
38	16
39	217
40	1810
41	6101
42	2974
43	1
44	0
45	1
46	1
47	19
48	331
49	4085
50	27631
51	65719
52	17060
53	1
54	0
55	1
56	1
57	22
58	469
59	7746
60	82593
61	441604
62	729933
63	99658
64	1
65	0

[1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 4, 1, 0, 1, 1, 7, 19, 1, 0, 1, 1, 10, 61, 98, 1, 0, 1, 1, 13, 127, 591, 531, 1, 0, 1, 1, 16, 217, 1810, 6101, 2974, 1, 0, 1, 1, 19, 331, 4085, 27631, 65719, 17060, 1, 0, 1, 1, 22, 469, 7746, 82593, 441604, 729933, 99658, 1, 0]

cp's OEIS Frontend

A213027 Number A(n,k) of 3n-length k-ary words, either empty or beginning with the first letter of the alphabet, that can be built by repeatedly inserting triples of identical letters into the initially empty word; square array A(n,k), n>=0, k>=0, by antidiagonals.

Table of values

List of values