A123672 - cp's OEIS frontend

A123672 a(1) = 1; for n > 1, a(n) = (2^n-1)*a(n-1) + (-1)^n.

n	a(n)
1	1
2	4
3	27
4	406
5	12585
6	792856
7	100692711
8	25676641306
9	13120763707365
10	13422541272634396
11	27475941985082608611
12	112513982428913282262046
13	921602030075228695008418785
14	15098606058722471710322924954656
15	494736024726159230532151281989213151

[1, 4, 27, 406, 12585, 792856, 100692711, 25676641306, 13120763707365, 13422541272634396, 27475941985082608611, 112513982428913282262046, 921602030075228695008418785, 15098606058722471710322924954656, 494736024726159230532151281989213151]

cp's OEIS Frontend

A123672 a(1) = 1; for n > 1, a(n) = (2^n-1)*a(n-1) + (-1)^n.

Table of values

List of values