A084777 - cp's OEIS frontend

A084777 a(n) = sum of absolute-valued coefficients of (1+2x-2x^2)^n.

n	a(n)
0	1
1	5
2	17
3	73
4	273
5	881
6	3785
7	13081
8	48737
9	184321
10	632193
11	2526305
12	8854081
13	32077921
14	124093025
15	428178641
16	1638563969
17	5878561921
18	21469361537
19	82252171393
20	286863949025
21	1061000856417
22	3998983314849
23	14361380710817

[1, 5, 17, 73, 273, 881, 3785, 13081, 48737, 184321, 632193, 2526305, 8854081, 32077921, 124093025, 428178641, 1638563969, 5878561921, 21469361537, 82252171393, 286863949025, 1061000856417, 3998983314849, 14361380710817]

cp's OEIS Frontend

A084777 a(n) = sum of absolute-valued coefficients of (1+2x-2x^2)^n.

Table of values

List of values

cp's OEIS Frontend

A084777 a(n) = sum of absolute-valued coefficients of (1+2*x-2*x^2)^n.

Table of values

List of values

A084777 a(n) = sum of absolute-valued coefficients of (1+2x-2x^2)^n.