A368840 - cp's OEIS frontend

A368840 a(n) = n! * (n+1)! * (n+2)! * Sum_{k=0..n} 1/(6^(n-k) * k! * (k+1)! * (k+2)!).

n	a(n)
0	1
1	2
2	9
3	91
4	1821
5	63736
6	3569217
7	299814229
8	35977707481
9	5936321734366
10	1305990781560521
11	373513363526309007
12	135958864323576478549
13	61861283267227297739796
14	34642318629647286734285761
15	23556776668160154979314317481

[1, 2, 9, 91, 1821, 63736, 3569217, 299814229, 35977707481, 5936321734366, 1305990781560521, 373513363526309007, 135958864323576478549, 61861283267227297739796, 34642318629647286734285761, 23556776668160154979314317481]

cp's OEIS Frontend

A368840 a(n) = n! * (n+1)! * (n+2)! * Sum_{k=0..n} 1/(6^(n-k) * k! * (k+1)! * (k+2)!).

Table of values

List of values