A076177 - cp's OEIS frontend

A076177 a(n) = n! * Sum_{ 0<=i<=j<=k<=n, i+j+k<=n } 1/(i!j!k!).

n	a(n)
0	1
1	2
2	7
3	31
4	147
5	801
6	5028
7	35757
8	287703
9	2594737
10	25961688
11	285620919
12	3427588046
13	44559016789
14	623827340321
15	9357413642355
16	149718628050447
17	2545216705948425
18	45813900799435848
19	870464115447489783
20	17409282309719616078
21	365594928506541029523
22	8043088427150753393871

[1, 2, 7, 31, 147, 801, 5028, 35757, 287703, 2594737, 25961688, 285620919, 3427588046, 44559016789, 623827340321, 9357413642355, 149718628050447, 2545216705948425, 45813900799435848, 870464115447489783, 17409282309719616078, 365594928506541029523, 8043088427150753393871]

cp's OEIS Frontend

A076177 a(n) = n! * Sum_{ 0<=i<=j<=k<=n, i+j+k<=n } 1/(i!j!k!).

Table of values

List of values

cp's OEIS Frontend

A076177 a(n) = n! * Sum_{ 0<=i<=j<=k<=n, i+j+k<=n } 1/(i!*j!*k!).

Table of values

List of values

A076177 a(n) = n! * Sum_{ 0<=i<=j<=k<=n, i+j+k<=n } 1/(i!j!k!).