This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A034904 Related to sept-factorial numbers A045754. 2

%I

%S 1,28,980,37730,1531838,64337196,2766499428,121034349975,

%T 5365856182225,240390356963680,10861273400995360,494187939745288880,

%U 22618601857572837200,1040455685448350511200,48069052667713793617440

%N Related to sept-factorial numbers A045754.

%C Convolution of A034835(n-1) with A025752(n), n >= 1.

%H <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>

%F a(n) = 7^(n-1)*A045754(n)/n!, A045754(n)=(7*n-6)(!^7) := product(7*j-6, j=1..n); G.f. (-1+(1-49*x)^(-1/7))/7.

%t CoefficientList[Series[(Power[1-49x, (-7)^-1]-1)/7,{x,0,30}],x] (* _Harvey P. Dale_, Aug 23 2011 *)

%Y Cf. A045754, A034835, A025752.

%K easy,nonn

%O 1,2

%A _Wolfdieter Lang_

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 18 12:06 EST 2018. Contains 318229 sequences. (Running on oeis4.)