A133307 - cp's OEIS frontend

A133307 a(n) = (1/n)Sum_{i=0..n-1} C(n,i)C(n,i+1)6^i7^(n-i), a(0)=1.

n	a(n)
0	1
1	7
2	91
3	1477
4	26845
5	522739
6	10663471
7	224939113
8	4866571801
9	107393779423
10	2407939176643
11	54700070934061
12	1256249370578293
13	29119953189833611
14	680401905145643863
15	16008309928027493713
16	378930780842531820721
17	9017843351806985482423
18	215634517504141993966891

[1, 7, 91, 1477, 26845, 522739, 10663471, 224939113, 4866571801, 107393779423, 2407939176643, 54700070934061, 1256249370578293, 29119953189833611, 680401905145643863, 16008309928027493713, 378930780842531820721, 9017843351806985482423, 215634517504141993966891]

cp's OEIS Frontend

A133307 a(n) = (1/n)Sum_{i=0..n-1} C(n,i)C(n,i+1)6^i7^(n-i), a(0)=1.

Table of values

List of values

cp's OEIS Frontend

A133307 a(n) = (1/n)*Sum_{i=0..n-1} C(n,i)*C(n,i+1)*6^i*7^(n-i), a(0)=1.

Table of values

List of values

A133307 a(n) = (1/n)Sum_{i=0..n-1} C(n,i)C(n,i+1)6^i7^(n-i), a(0)=1.