A156786 - cp's OEIS frontend

A156786 The triangular sequence of symmetrical Lah numbers (A111596, A008297) : L(n, m) = (-1)^n* binomial(n,k)binomial(n-1, k-1)( (n-k)! + (n-k)*(k-1)! ), with L(0,0) = 2, L(n,0) = L(n,n) = (-1)^n.

n	a(n)
0	2
1	-1
2	-1
3	1
4	4
5	1
6	-1
7	-12
8	-12
9	-1
10	1
11	36
12	72
13	36
14	1
15	-1
16	-140
17	-360
18	-360
19	-140
20	-1
21	1
22	750
23	2100
24	2400
25	2100
26	750
27	1
28	-1
29	-5082
30	-15750
31	-16800
32	-16800
33	-15750
34	-5082
35	-1
36	1
37	40376
38	142296
39	152880
40	117600
41	152880
42	142296
43	40376
44	1
45	-1
46	-362952
47	-1453536

[2, -1, -1, 1, 4, 1, -1, -12, -12, -1, 1, 36, 72, 36, 1, -1, -140, -360, -360, -140, -1, 1, 750, 2100, 2400, 2100, 750, 1, -1, -5082, -15750, -16800, -16800, -15750, -5082, -1, 1, 40376, 142296, 152880, 117600, 152880, 142296, 40376, 1, -1, -362952, -1453536]

cp's OEIS Frontend

A156786 The triangular sequence of symmetrical Lah numbers (A111596, A008297) : L(n, m) = (-1)^n* binomial(n,k)binomial(n-1, k-1)( (n-k)! + (n-k)*(k-1)! ), with L(0,0) = 2, L(n,0) = L(n,n) = (-1)^n.

Table of values

List of values

cp's OEIS Frontend

A156786 The triangular sequence of symmetrical Lah numbers (A111596, A008297) : L(n, m) = (-1)^n* binomial(n,k)*binomial(n-1, k-1)*( (n-k)! + (n-k)*(k-1)! ), with L(0,0) = 2, L(n,0) = L(n,n) = (-1)^n.

Table of values

List of values

A156786 The triangular sequence of symmetrical Lah numbers (A111596, A008297) : L(n, m) = (-1)^n* binomial(n,k)binomial(n-1, k-1)( (n-k)! + (n-k)*(k-1)! ), with L(0,0) = 2, L(n,0) = L(n,n) = (-1)^n.