A215172 - cp's OEIS frontend

A215172 a(0)=1, a(n) = a(n-1)*4^n + 2^n - 1. That is, add n 0's and n 1's to the binary representation of previous term.

n	a(n)
0	1
1	5
2	83
3	5319
4	1361679
5	1394359327
6	5711295803455
7	93573870443806847
8	6132457173405325525247
9	1607586853265165654490350079
10	1685676992249374341322873324438527
11	7070241751299519797307892876185811552255

[1, 5, 83, 5319, 1361679, 1394359327, 5711295803455, 93573870443806847, 6132457173405325525247, 1607586853265165654490350079, 1685676992249374341322873324438527, 7070241751299519797307892876185811552255]

cp's OEIS Frontend

A215172 a(0)=1, a(n) = a(n-1)*4^n + 2^n - 1. That is, add n 0's and n 1's to the binary representation of previous term.

Table of values

List of values