A260642 - cp's OEIS frontend

A260642 Numbers in A004782, n-1 | C(n-1), but not in A081767, n-1 | C(n), where C(n) = A000108(n) = 2n!/n!(n+1)! are the Catalan numbers.

n	a(n)
1	3
2	7
3	127
4	511
5	4095
6	8191
7	131071
8	8388607
9	33554431
10	67108863
11	2147483647
12	8589934591
13	137438953471
14	2199023255551
15	17592186044415
16	35184372088831
17	70368744177663
18	281474976710655
19	562949953421311
20	36028797018963967
21	72057594037927935

[3, 7, 127, 511, 4095, 8191, 131071, 8388607, 33554431, 67108863, 2147483647, 8589934591, 137438953471, 2199023255551, 17592186044415, 35184372088831, 70368744177663, 281474976710655, 562949953421311, 36028797018963967, 72057594037927935]

cp's OEIS Frontend

A260642 Numbers in A004782, n-1 | C(n-1), but not in A081767, n-1 | C(n), where C(n) = A000108(n) = 2n!/n!(n+1)! are the Catalan numbers.

Table of values

List of values