A356684 - cp's OEIS frontend

A356684 a(n) = (n-1)a(n-1) - na(n-2), with a(1) = a(2) = -1.

n	a(n)
1	-1
2	-1
3	1
4	7
5	23
6	73
7	277
8	1355
9	8347
10	61573
11	523913
12	5024167
13	53479135
14	624890417
15	7946278813
16	109195935523
17	1612048228547
18	25439293045885
19	427278358483537
20	7609502950269503
21	143217213477235783
22	2840152418116022377

[-1, -1, 1, 7, 23, 73, 277, 1355, 8347, 61573, 523913, 5024167, 53479135, 624890417, 7946278813, 109195935523, 1612048228547, 25439293045885, 427278358483537, 7609502950269503, 143217213477235783, 2840152418116022377]

cp's OEIS Frontend

A356684 a(n) = (n-1)a(n-1) - na(n-2), with a(1) = a(2) = -1.

Table of values

List of values

cp's OEIS Frontend

A356684 a(n) = (n-1)*a(n-1) - n*a(n-2), with a(1) = a(2) = -1.

Table of values

List of values

A356684 a(n) = (n-1)a(n-1) - na(n-2), with a(1) = a(2) = -1.