A372412 - cp's OEIS frontend

A372412 Coefficient of x^n in the expansion of ( (1-x+x^2) / (1-x) )^(3*n).

n	a(n)
0	1
1	0
2	6
3	9
4	78
5	225
6	1293
7	4851
8	24174
9	101583
10	480531
11	2123913
12	9869973
13	44669742
14	206614827
15	946394109
16	4378019310
17	20189406771
18	93556141449
19	433284753414
20	2011960692003
21	9345929458455
22	43484293732413
23	202453490369727
24	943647920498997
25	4401470801019600

[1, 0, 6, 9, 78, 225, 1293, 4851, 24174, 101583, 480531, 2123913, 9869973, 44669742, 206614827, 946394109, 4378019310, 20189406771, 93556141449, 433284753414, 2011960692003, 9345929458455, 43484293732413, 202453490369727, 943647920498997, 4401470801019600]

cp's OEIS Frontend

A372412 Coefficient of x^n in the expansion of ( (1-x+x^2) / (1-x) )^(3*n).

Table of values

List of values