A187988 - cp's OEIS frontend

A187988 T(n,k) = number of nondecreasing arrangements of n numbers x(i) in -(n+k-2)..(n+k-2) with the sum of sign(x(i))*2^|x(i)| zero.

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	3
7	0
8	3
9	5
10	9
11	0
12	4
13	7
14	15
15	36
16	0
17	5
18	9
19	22
20	57
21	117
22	0
23	6
24	11
25	30
26	82
27	181
28	411
29	0
30	7
31	13
32	39
33	111
34	260
35	632
36	1452
37	0
38	8
39	15
40	49
41	144
42	355
43	912
44	2199
45	5040
46	0
47	9
48	17
49	60
50	181
51	467
52	1257
53	3158
54	7593
55	17829
56	0
57	10
58	19
59	72
60	222
61	597
62	1673
63	4357
64	10920
65	26706
66	62870

[0, 0, 1, 0, 2, 3, 0, 3, 5, 9, 0, 4, 7, 15, 36, 0, 5, 9, 22, 57, 117, 0, 6, 11, 30, 82, 181, 411, 0, 7, 13, 39, 111, 260, 632, 1452, 0, 8, 15, 49, 144, 355, 912, 2199, 5040, 0, 9, 17, 60, 181, 467, 1257, 3158, 7593, 17829, 0, 10, 19, 72, 222, 597, 1673, 4357, 10920, 26706, 62870]

cp's OEIS Frontend

A187988 T(n,k) = number of nondecreasing arrangements of n numbers x(i) in -(n+k-2)..(n+k-2) with the sum of sign(x(i))*2^|x(i)| zero.

Table of values

List of values