A303188 - cp's OEIS frontend

A303188 a(n) = [x^n] Product_{k=1..n} (1 + (n - k + 1)*x^k).

n	a(n)
0	1
1	1
2	1
3	7
4	9
5	23
6	148
7	221
8	526
9	1040
10	6767
11	9664
12	23456
13	43943
14	91363
15	499028
16	736410
17	1650395
18	3107540
19	6210372
20	10819270
21	57864166
22	80663444
23	179915133
24	324882691
25	640398244
26	1087149284
27	2039724322
28	9121580902
29	12913282685
30	27250167385
31	48645989650
32	92634730208
33	156124357449

[1, 1, 1, 7, 9, 23, 148, 221, 526, 1040, 6767, 9664, 23456, 43943, 91363, 499028, 736410, 1650395, 3107540, 6210372, 10819270, 57864166, 80663444, 179915133, 324882691, 640398244, 1087149284, 2039724322, 9121580902, 12913282685, 27250167385, 48645989650, 92634730208, 156124357449]

cp's OEIS Frontend

A303188 a(n) = [x^n] Product_{k=1..n} (1 + (n - k + 1)*x^k).

Table of values

List of values