A172528 - cp's OEIS frontend

A172528 Triangular array T(n,k) n,k>=0 is the number of k letter words formed using at most 1a,2b's,3c's,...,n#'s.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	3
6	3
7	1
8	3
9	8
10	19
11	38
12	60
13	60
14	1
15	4
16	15
17	53
18	175
19	535
20	1490
21	3675
22	7700
23	12600
24	12600
25	1
26	5
27	24
28	111
29	494
30	2111
31	8634
32	33635
33	123998
34	428820
35	1373820
36	4003230
37	10325700
38	22522500
39	37837800
40	37837800

[1, 1, 1, 1, 2, 3, 3, 1, 3, 8, 19, 38, 60, 60, 1, 4, 15, 53, 175, 535, 1490, 3675, 7700, 12600, 12600, 1, 5, 24, 111, 494, 2111, 8634, 33635, 123998, 428820, 1373820, 4003230, 10325700, 22522500, 37837800, 37837800]

cp's OEIS Frontend

A172528 Triangular array T(n,k) n,k>=0 is the number of k letter words formed using at most 1a,2b's,3c's,...,n#'s.

Table of values

List of values