A103210 - cp's OEIS frontend

A103210 a(n) = (1/n) * Sum_{i=0..n-1} C(n,i)C(n,i+1)2^i*3^(n-i), a(0)=1.

n	a(n)
0	1
1	3
2	15
3	93
4	645
5	4791
6	37275
7	299865
8	2474025
9	20819307
10	178003815
11	1541918901
12	13503125805
13	119352115551
14	1063366539315
15	9539785668657
16	86104685123025
17	781343125570515
18	7124072211203775
19	65233526296899981
20	599633539433039445
21	5531156299278726663

[1, 3, 15, 93, 645, 4791, 37275, 299865, 2474025, 20819307, 178003815, 1541918901, 13503125805, 119352115551, 1063366539315, 9539785668657, 86104685123025, 781343125570515, 7124072211203775, 65233526296899981, 599633539433039445, 5531156299278726663]

cp's OEIS Frontend

A103210 a(n) = (1/n) * Sum_{i=0..n-1} C(n,i)C(n,i+1)2^i*3^(n-i), a(0)=1.

Table of values

List of values

cp's OEIS Frontend

A103210 a(n) = (1/n) * Sum_{i=0..n-1} C(n,i)*C(n,i+1)*2^i*3^(n-i), a(0)=1.

Table of values

List of values

A103210 a(n) = (1/n) * Sum_{i=0..n-1} C(n,i)C(n,i+1)2^i*3^(n-i), a(0)=1.