A318108 - cp's OEIS frontend

A318108 a(n) = Sum_{k=0..n} (3n-2k)!/((n-k)!^3k!)(-3)^k, n >= 0.

n	a(n)
0	1
1	3
2	27
3	303
4	3771
5	49653
6	677979
7	9496791
8	135572859
9	1963940073
10	28783474677
11	425872190241
12	6350923156059
13	95341185353781
14	1439433069482547
15	21839152342265703
16	332769145298428539
17	5089688869615075521
18	78108038975852093889
19	1202268428203687094493
20	18555675891246972931221

[1, 3, 27, 303, 3771, 49653, 677979, 9496791, 135572859, 1963940073, 28783474677, 425872190241, 6350923156059, 95341185353781, 1439433069482547, 21839152342265703, 332769145298428539, 5089688869615075521, 78108038975852093889, 1202268428203687094493, 18555675891246972931221]

cp's OEIS Frontend

A318108 a(n) = Sum_{k=0..n} (3n-2k)!/((n-k)!^3k!)(-3)^k, n >= 0.

Table of values

List of values

cp's OEIS Frontend

A318108 a(n) = Sum_{k=0..n} (3*n-2*k)!/((n-k)!^3*k!)*(-3)^k, n >= 0.

Table of values

List of values

A318108 a(n) = Sum_{k=0..n} (3n-2k)!/((n-k)!^3k!)(-3)^k, n >= 0.