A322226 - cp's OEIS frontend

A322226 a(n) = A322227(n) / (n(n+1)/2), where A322227(n) = [x^(n-1)] Product_{k=1..n} (k + x - kx^2), for n >= 1.

n	a(n)
1	1
2	1
3	-2
4	-14
5	36
6	736
7	-1819
8	-88227
9	163185
10	19160769
11	-15294993
12	-6611719113
13	-4120456053
14	3331391605595
15	7909978546731
16	-2311176691053557
17	-10230565685787877
18	2114443392338548619
19	14290732101459857168
20	-2468208492961535459212
21	-23089123066195736850322
22	3581650102772343613724618
23	43704098963536055443651815
24	-6326399008631824968253597825
25	-96742680150222152446019734205

[1, 1, -2, -14, 36, 736, -1819, -88227, 163185, 19160769, -15294993, -6611719113, -4120456053, 3331391605595, 7909978546731, -2311176691053557, -10230565685787877, 2114443392338548619, 14290732101459857168, -2468208492961535459212, -23089123066195736850322, 3581650102772343613724618, 43704098963536055443651815, -6326399008631824968253597825, -96742680150222152446019734205]

cp's OEIS Frontend

A322226 a(n) = A322227(n) / (n(n+1)/2), where A322227(n) = [x^(n-1)] Product_{k=1..n} (k + x - kx^2), for n >= 1.

Table of values

List of values

cp's OEIS Frontend

A322226 a(n) = A322227(n) / (n*(n+1)/2), where A322227(n) = [x^(n-1)] Product_{k=1..n} (k + x - k*x^2), for n >= 1.

Table of values

List of values

A322226 a(n) = A322227(n) / (n(n+1)/2), where A322227(n) = [x^(n-1)] Product_{k=1..n} (k + x - kx^2), for n >= 1.