A227804 - cp's OEIS frontend

A227804 a(1) = greatest k such that H(k) - H(8) < H(8) - H(4); a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(8), and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.

n	a(n)
1	15
2	27
3	48
4	85
5	150
6	264
7	464
8	815
9	1431
10	2512
11	4409
12	7738
13	13580
14	23832
15	41823
16	73395
17	128800
18	226029
19	396654
20	696080
21	1221536
22	2143647
23	3761839
24	6601568
25	11584945
26	20330162
27	35676948
28	62608680
29	109870575
30	192809419
31	338356944
32	593775045
33	1042002566

[15, 27, 48, 85, 150, 264, 464, 815, 1431, 2512, 4409, 7738, 13580, 23832, 41823, 73395, 128800, 226029, 396654, 696080, 1221536, 2143647, 3761839, 6601568, 11584945, 20330162, 35676948, 62608680, 109870575, 192809419, 338356944, 593775045, 1042002566]

cp's OEIS Frontend

A227804 a(1) = greatest k such that H(k) - H(8) < H(8) - H(4); a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(8), and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.

Table of values

List of values