A213907 - cp's OEIS frontend

A213907 a(n) = 1 + n + n{n/2} + n{n/2}{n/3} + n{n/2}{n/3}{n/4} +... where {x} = [x+1/2] = round(x).

n	a(n)
0	1
1	3
2	9
3	34
4	61
5	261
6	709
7	1324
8	4937
9	15040
10	28561
11	107262
12	248341
13	522445
14	1972363
15	7591936
16	8835345
17	26421129
18	145475533
19	183752250
20	701184621
21	2234736295
22	2996725227
23	15105451596
24	32483720761
25	77618520551
26	217809217211
27	625456400842
28	1638545943301

[1, 3, 9, 34, 61, 261, 709, 1324, 4937, 15040, 28561, 107262, 248341, 522445, 1972363, 7591936, 8835345, 26421129, 145475533, 183752250, 701184621, 2234736295, 2996725227, 15105451596, 32483720761, 77618520551, 217809217211, 625456400842, 1638545943301]

cp's OEIS Frontend

A213907 a(n) = 1 + n + n{n/2} + n{n/2}{n/3} + n{n/2}{n/3}{n/4} +... where {x} = [x+1/2] = round(x).

Table of values

List of values

cp's OEIS Frontend

A213907 a(n) = 1 + n + n*{n/2} + n*{n/2}*{n/3} + n*{n/2}*{n/3}*{n/4} +... where {x} = [x+1/2] = round(x).

Table of values

List of values

A213907 a(n) = 1 + n + n{n/2} + n{n/2}{n/3} + n{n/2}{n/3}{n/4} +... where {x} = [x+1/2] = round(x).