A075887 - cp's OEIS frontend

A075887 a(n) = 1 + n + n[n/2] + n[n/2][n/3] +... + n[n/2][n/3]...[n/n], where [x]=ceiling(x).

n	a(n)
0	1
1	2
2	5
3	16
4	45
5	171
6	421
7	1968
8	4553
9	19225
10	57261
11	226854
12	496309
13	3136420
14	6764563
15	24850336
16	84877201
17	380461599
18	805949533
19	4411165990
20	9288196621
21	48275465722
22	154143694937
23	527401107276
24	1100708161081
25	8151403215501

[1, 2, 5, 16, 45, 171, 421, 1968, 4553, 19225, 57261, 226854, 496309, 3136420, 6764563, 24850336, 84877201, 380461599, 805949533, 4411165990, 9288196621, 48275465722, 154143694937, 527401107276, 1100708161081, 8151403215501]

cp's OEIS Frontend

A075887 a(n) = 1 + n + n[n/2] + n[n/2][n/3] +... + n[n/2][n/3]...[n/n], where [x]=ceiling(x).

Table of values

List of values