A192380 - cp's OEIS frontend

A192380 Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.

n	a(n)
1	0
2	2
3	4
4	20
5	60
6	230
7	776
8	2792
9	9720
10	34410
11	120780
12	425788
13	1497716
14	5274190
15	18562320
16	65348560
17	230024944
18	809742418
19	2850375060
20	10033806180
21	35320352940
22	124333050422
23	437670231064
24	1540664252600
25	5423363437800
26	19091038878650
27	67203259647836

[0, 2, 4, 20, 60, 230, 776, 2792, 9720, 34410, 120780, 425788, 1497716, 5274190, 18562320, 65348560, 230024944, 809742418, 2850375060, 10033806180, 35320352940, 124333050422, 437670231064, 1540664252600, 5423363437800, 19091038878650, 67203259647836]

cp's OEIS Frontend

A192380 Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.

Table of values

List of values