A230878 - cp's OEIS frontend

A230878 Irregular triangle read by rows: T(n,k) = number of 2-packed n X n matrices with exactly k nonzero entries (0 <= k <= n^2).

n	a(n)
0	1
1	0
2	2
3	0
4	0
5	8
6	32
7	16
8	0
9	0
10	0
11	48
12	720
13	2880
14	4992
15	4608
16	2304
17	512
18	0
19	0
20	0
21	0
22	384
23	13824
24	143872
25	739328
26	2320896
27	4964352
28	7659520
29	8749056
30	7421952
31	4587520
32	1966080
33	524288
34	65536
35	0
36	0
37	0
38	0
39	0
40	3840
41	268800
42	5504000
43	57068800
44	372416000

[1, 0, 2, 0, 0, 8, 32, 16, 0, 0, 0, 48, 720, 2880, 4992, 4608, 2304, 512, 0, 0, 0, 0, 384, 13824, 143872, 739328, 2320896, 4964352, 7659520, 8749056, 7421952, 4587520, 1966080, 524288, 65536, 0, 0, 0, 0, 0, 3840, 268800, 5504000, 57068800, 372416000]

cp's OEIS Frontend

A230878 Irregular triangle read by rows: T(n,k) = number of 2-packed n X n matrices with exactly k nonzero entries (0 <= k <= n^2).

Table of values

List of values