A092934 a(n) = floor((product of next n even numbers) / (product of first n odd numbers)).

2, 8, 64, 768, 12202, 240546, 5652480, 154090259, 4777917500, 165999652648, 6386199899437, 269455867248640, 12371082837260281, 613924958232961934, 32745240915899894988, 1868019304186661949347, 113491057175295931012181

Offset: 1

Author

Amarnath Murthy, Mar 22 2004

Keywords

• nonn
• less

Programs

Mathematica

Table[Floor[2^n(n (n + 1)/2)!/(((n - 1) n/2)!*(2n - 1)!!)], {n, 1, 20}] (* Stefan Steinerberger, Jan 28 2006 *)

Formula

a(n) = floor(2^n*A057003(n)/A001147(n)).

Extensions

More terms from Stefan Steinerberger, Jan 28 2006