A123199 - cp's OEIS frontend

A123199 Irregular triangle read by rows: row n is the expansion of (1 + 2*x - x^2)^n.

n	a(n)
0	1
1	1
2	2
3	-1
4	1
5	4
6	2
7	-4
8	1
9	1
10	6
11	9
12	-4
13	-9
14	6
15	-1
16	1
17	8
18	20
19	8
20	-26
21	-8
22	20
23	-8
24	1
25	1
26	10
27	35
28	40
29	-30
30	-68
31	30
32	40
33	-35
34	10
35	-1
36	1
37	12
38	54
39	100
40	15
41	-168
42	-76
43	168
44	15
45	-100
46	54
47	-12
48	1
49	1
50	14
51	77
52	196
53	161
54	-238
55	-427
56	184
57	427
58	-238
59	-161
60	196
61	-77
62	14

[1, 1, 2, -1, 1, 4, 2, -4, 1, 1, 6, 9, -4, -9, 6, -1, 1, 8, 20, 8, -26, -8, 20, -8, 1, 1, 10, 35, 40, -30, -68, 30, 40, -35, 10, -1, 1, 12, 54, 100, 15, -168, -76, 168, 15, -100, 54, -12, 1, 1, 14, 77, 196, 161, -238, -427, 184, 427, -238, -161, 196, -77, 14]

cp's OEIS Frontend

A123199 Irregular triangle read by rows: row n is the expansion of (1 + 2*x - x^2)^n.

Table of values

List of values