A123114 - cp's OEIS frontend

A123114 a(n) = Sum_{r>0,s>0} binomial(r*s-1,n-1)/2^(r+s).

n	a(n)
1	1
2	3
3	13
4	83
5	701
6	7363
7	92541
8	1354627
9	22636861
10	425241347
11	8871085565
12	203487078403
13	5090418231549
14	137920771272963
15	4023549748488445
16	125743894742698243
17	4191213031967650813
18	148414827031140706307

[1, 3, 13, 83, 701, 7363, 92541, 1354627, 22636861, 425241347, 8871085565, 203487078403, 5090418231549, 137920771272963, 4023549748488445, 125743894742698243, 4191213031967650813, 148414827031140706307]

cp's OEIS Frontend

A123114 a(n) = Sum_{r>0,s>0} binomial(r*s-1,n-1)/2^(r+s).

Table of values

List of values