A259877 - cp's OEIS frontend

A259877 If n is even then a(n) = n!/( 2^(n/2)(n/2)! ), otherwise a(n) = n!/( 32^((n-1)/2)*((n-3)/2)! ).

n	a(n)
2	1
3	1
4	3
5	10
6	15
7	105
8	105
9	1260
10	945
11	17325
12	10395
13	270270
14	135135
15	4729725
16	2027025
17	91891800
18	34459425
19	1964187225
20	654729075
21	45831035250
22	13749310575
23	1159525191825
24	316234143225
25	31623414322500
26	7905853580625
27	924984868933125
28	213458046676875
29	28887988983603750
30	6190283353629375

[1, 1, 3, 10, 15, 105, 105, 1260, 945, 17325, 10395, 270270, 135135, 4729725, 2027025, 91891800, 34459425, 1964187225, 654729075, 45831035250, 13749310575, 1159525191825, 316234143225, 31623414322500, 7905853580625, 924984868933125, 213458046676875, 28887988983603750, 6190283353629375]

cp's OEIS Frontend

A259877 If n is even then a(n) = n!/( 2^(n/2)(n/2)! ), otherwise a(n) = n!/( 32^((n-1)/2)*((n-3)/2)! ).

Table of values

List of values

cp's OEIS Frontend

A259877 If n is even then a(n) = n!/( 2^(n/2)*(n/2)! ), otherwise a(n) = n!/( 3*2^((n-1)/2)*((n-3)/2)! ).

Table of values

List of values

A259877 If n is even then a(n) = n!/( 2^(n/2)(n/2)! ), otherwise a(n) = n!/( 32^((n-1)/2)*((n-3)/2)! ).