A372266 - cp's OEIS frontend

A372266 a(n) = floor((2n - 3 + sqrt(1 + 8(n - 2)!))/2).

n	a(n)
2	2
3	3
4	4
5	7
6	11
7	21
8	44
9	107
10	292
11	861
12	2704
13	8946
14	30964
15	111611
16	417574
17	1617219
18	6468832
19	26671628
20	113158082
21	493244584
22	2205856773
23	10108505566
24	47413093736
25	227385209476
26	1113955476453
27	5569777382171
28	28400403557955
29	147572825753404
30	780881994429038

[2, 3, 4, 7, 11, 21, 44, 107, 292, 861, 2704, 8946, 30964, 111611, 417574, 1617219, 6468832, 26671628, 113158082, 493244584, 2205856773, 10108505566, 47413093736, 227385209476, 1113955476453, 5569777382171, 28400403557955, 147572825753404, 780881994429038]

cp's OEIS Frontend

A372266 a(n) = floor((2n - 3 + sqrt(1 + 8(n - 2)!))/2).

Table of values

List of values

cp's OEIS Frontend

A372266 a(n) = floor((2*n - 3 + sqrt(1 + 8*(n - 2)!))/2).

Table of values

List of values

A372266 a(n) = floor((2n - 3 + sqrt(1 + 8(n - 2)!))/2).