A086881 - cp's OEIS frontend

A086881 a(n) = (2n)!Sum[Sum[1/(i+j),{i,1,n}],{j,1,n}].

n	a(n)
1	1
2	34
3	1788
4	146256
5	17485920
6	2894002560
7	635331029760
8	178910029670400
9	62920533840998400
10	27042268338763776000
11	13950701922125574144000
12	8509745665997194493952000
13	6059691013778107566981120000

[1, 34, 1788, 146256, 17485920, 2894002560, 635331029760, 178910029670400, 62920533840998400, 27042268338763776000, 13950701922125574144000, 8509745665997194493952000, 6059691013778107566981120000]

cp's OEIS Frontend

A086881 a(n) = (2n)!Sum[Sum[1/(i+j),{i,1,n}],{j,1,n}].

Table of values

List of values

cp's OEIS Frontend

A086881 a(n) = (2*n)!*Sum[Sum[1/(i+j),{i,1,n}],{j,1,n}].

Table of values

List of values

A086881 a(n) = (2n)!Sum[Sum[1/(i+j),{i,1,n}],{j,1,n}].