A260854 - cp's OEIS frontend

A260854 Base-4 representation of a(n) is the concatenation of the base-4 representations of 1, 2, ..., n, n-1, ..., 1.

n	a(n)
0	0
1	1
2	25
3	441
4	27961
5	7148857
6	1830131001
7	468514084153
8	119939614479673
9	30704541449950521
10	7860362613477971257
11	2012252829087011018041
12	515136724246861226808633
13	131875001407205856562222393
14	33760000360244849399916500281
15	8642560092222683848298425324857

[0, 1, 25, 441, 27961, 7148857, 1830131001, 468514084153, 119939614479673, 30704541449950521, 7860362613477971257, 2012252829087011018041, 515136724246861226808633, 131875001407205856562222393, 33760000360244849399916500281, 8642560092222683848298425324857]

cp's OEIS Frontend

A260854 Base-4 representation of a(n) is the concatenation of the base-4 representations of 1, 2, ..., n, n-1, ..., 1.

Table of values

List of values