A105927 - cp's OEIS frontend

A105927 Let d(n) = A000166(n); then a(n) = ( (n^2+n-1)d(n) + (-1)^(n-1)(n-1) )/2.

n	a(n)
0	0
1	0
2	2
3	12
4	84
5	640
6	5430
7	50988
8	526568
9	5940576
10	72755370
11	961839340
12	13656650172
13	207316760352
14	3351430059614
15	57487448630220
16	1042952206111440
17	19954639072648768
18	401578933206288978
19	8480263630552747596
20	187505565234912994340
21	4332318322289242716480

[0, 0, 2, 12, 84, 640, 5430, 50988, 526568, 5940576, 72755370, 961839340, 13656650172, 207316760352, 3351430059614, 57487448630220, 1042952206111440, 19954639072648768, 401578933206288978, 8480263630552747596, 187505565234912994340, 4332318322289242716480]

cp's OEIS Frontend

A105927 Let d(n) = A000166(n); then a(n) = ( (n^2+n-1)d(n) + (-1)^(n-1)(n-1) )/2.

Table of values

List of values

cp's OEIS Frontend

A105927 Let d(n) = A000166(n); then a(n) = ( (n^2+n-1)*d(n) + (-1)^(n-1)*(n-1) )/2.

Table of values

List of values

A105927 Let d(n) = A000166(n); then a(n) = ( (n^2+n-1)d(n) + (-1)^(n-1)(n-1) )/2.