A076176 - cp's OEIS frontend

A076176 a(n) = n!*sum( i+j<=n, 1/i!/j! ) for 0 <= i <= j < n.

n	a(n)
0	1
1	2
2	7
3	25
4	111
5	571
6	3468
7	24340
8	194883
9	1754203
10	17542668
11	192970372
12	2315646974
13	30103414758
14	421447816520
15	6321717264184
16	101147476266147
17	1719507096590035
18	30951127738776012
19	588071427037006372

[1, 2, 7, 25, 111, 571, 3468, 24340, 194883, 1754203, 17542668, 192970372, 2315646974, 30103414758, 421447816520, 6321717264184, 101147476266147, 1719507096590035, 30951127738776012, 588071427037006372]

cp's OEIS Frontend

A076176 a(n) = n!*sum( i+j<=n, 1/i!/j! ) for 0 <= i <= j < n.

Table of values

List of values