A028339 - cp's OEIS frontend

A028339 Coefficient of x^2 in expansion of (x+1)(x+3)...(x+2n-1).

n	a(n)
2	1
3	9
4	86
5	950
6	12139
7	177331
8	2924172
9	53809164
10	1094071221
11	24372200061
12	590546123298
13	15467069396610
14	435512515705695
15	13121113142970855
16	421214220916438680
17	14354510691610713240
18	517596339235489288425
19	19688993487602867898225
20	787995759739909824183150

[1, 9, 86, 950, 12139, 177331, 2924172, 53809164, 1094071221, 24372200061, 590546123298, 15467069396610, 435512515705695, 13121113142970855, 421214220916438680, 14354510691610713240, 517596339235489288425, 19688993487602867898225, 787995759739909824183150]

cp's OEIS Frontend

A028339 Coefficient of x^2 in expansion of (x+1)(x+3)...(x+2n-1).

Table of values

List of values

cp's OEIS Frontend

A028339 Coefficient of x^2 in expansion of (x+1)*(x+3)*...*(x+2*n-1).

Table of values

List of values

A028339 Coefficient of x^2 in expansion of (x+1)(x+3)...(x+2n-1).