A226780 - cp's OEIS frontend

A226780 Triangular array read by rows. T(n,k) is the number of 2 tuple lists of length n that have exactly k coincidences; n >= 0, 0 <= k <= n.

n	a(n)
0	1
1	0
2	1
3	3
4	0
5	1
6	26
7	9
8	0
9	1
10	453
11	104
12	18
13	0
14	1
15	11844
16	2265
17	260
18	30
19	0
20	1
21	439975
22	71064
23	6795
24	520
25	45
26	0
27	1
28	22056222
29	3079825
30	248724
31	15855
32	910
33	63
34	0
35	1
36	1436236809
37	176449776
38	12319300
39	663264
40	31710
41	1456
42	84
43	0
44	1

[1, 0, 1, 3, 0, 1, 26, 9, 0, 1, 453, 104, 18, 0, 1, 11844, 2265, 260, 30, 0, 1, 439975, 71064, 6795, 520, 45, 0, 1, 22056222, 3079825, 248724, 15855, 910, 63, 0, 1, 1436236809, 176449776, 12319300, 663264, 31710, 1456, 84, 0, 1]

cp's OEIS Frontend

A226780 Triangular array read by rows. T(n,k) is the number of 2 tuple lists of length n that have exactly k coincidences; n >= 0, 0 <= k <= n.

Table of values

List of values