A192814 - cp's OEIS frontend

A192814 Constant term in the reduction of the polynomial (2*x+1)^n by x^3 -> x^2 + x + 1. See Comments.

n	a(n)
0	1
1	1
2	1
3	9
4	49
5	225
6	1041
7	4873
8	22817
9	106753
10	499425
11	2336585
12	10931921
13	51145825
14	239289457
15	1119533257
16	5237818689
17	24505519873
18	114650876097
19	536402551689
20	2509598769265
21	11741342323937
22	54932733173713
23	257006830281609

[1, 1, 1, 9, 49, 225, 1041, 4873, 22817, 106753, 499425, 2336585, 10931921, 51145825, 239289457, 1119533257, 5237818689, 24505519873, 114650876097, 536402551689, 2509598769265, 11741342323937, 54932733173713, 257006830281609]

cp's OEIS Frontend

A192814 Constant term in the reduction of the polynomial (2*x+1)^n by x^3 -> x^2 + x + 1. See Comments.

Table of values

List of values