A123702 - cp's OEIS frontend

A123702 a(1)=a(2)=1. For n >= 3, a(n) = (product{k=1 to n-1} a(k)) - (sum{j=1 to n-1} a(j)).

n	a(n)
1	1
2	1
3	-1
4	-2
5	3
6	4
7	18
8	408
9	175824
10	30989858688
11	960376803619751958528
12	922323604960653729254933704147036248735744
13	850680832267616036448642743307003648114050501920269009809993262836200003241653567488

[1, 1, -1, -2, 3, 4, 18, 408, 175824, 30989858688, 960376803619751958528, 922323604960653729254933704147036248735744, 850680832267616036448642743307003648114050501920269009809993262836200003241653567488]

cp's OEIS Frontend

A123702 a(1)=a(2)=1. For n >= 3, a(n) = (product{k=1 to n-1} a(k)) - (sum{j=1 to n-1} a(j)).

Table of values

List of values