A003504 - cp's OEIS frontend

A003504 a(0)=a(1)=1; thereafter a(n+1) = (1/n)*Sum_{k=0..n} a(k)^2 (a(n) is not always integral!).

n	a(n)
0	1
1	1
2	2
3	3
4	5
5	10
6	28
7	154
8	3520
9	1551880
10	267593772160
11	7160642690122633501504
12	4661345794146064133843098964919305264116096
13	1810678717716933442325741630275004084414865420898591223522682022447438928019172629856

[1, 1, 2, 3, 5, 10, 28, 154, 3520, 1551880, 267593772160, 7160642690122633501504, 4661345794146064133843098964919305264116096, 1810678717716933442325741630275004084414865420898591223522682022447438928019172629856]

cp's OEIS Frontend

A003504 a(0)=a(1)=1; thereafter a(n+1) = (1/n)*Sum_{k=0..n} a(k)^2 (a(n) is not always integral!).

Table of values

List of values