A006896 - cp's OEIS frontend

A006896 a(n) is the number of hierarchical linear models on n labeled factors allowing 2-way interactions (but no higher order interactions); or the number of simple labeled graphs with nodes chosen from an n-set.

n	a(n)
0	1
1	2
2	5
3	18
4	113
5	1450
6	40069
7	2350602
8	286192513
9	71213783666
10	35883905263781
11	36419649682706466
12	74221659280476136241
13	303193505953871645562970
14	2480118046704094643352358501
15	40601989176407026666590990422106
16	1329877330167226219547875498464516481

[1, 2, 5, 18, 113, 1450, 40069, 2350602, 286192513, 71213783666, 35883905263781, 36419649682706466, 74221659280476136241, 303193505953871645562970, 2480118046704094643352358501, 40601989176407026666590990422106, 1329877330167226219547875498464516481]

cp's OEIS Frontend

A006896 a(n) is the number of hierarchical linear models on n labeled factors allowing 2-way interactions (but no higher order interactions); or the number of simple labeled graphs with nodes chosen from an n-set.

Table of values

List of values