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A182421 a(n) = Sum_{k = 0..n} C(n,k)^7. 5
1, 2, 130, 4376, 312706, 20156252, 1622278624, 132282417920, 11716609750402, 1067553850832372, 101275413131018380, 9844149854624122160, 980597565209377223200, 99518148302583383833280, 10272819477206557916630080, 1075608762378043981968997376 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Vaclav Kotesovec, Recurrence (of order 4)

FORMULA

Asymptotic (p = 7): a(n) ~ 2^(p*n)/sqrt(p)*(2/(Pi*n))^((p - 1)/2)*( 1 - (p - 1)^2/(4*p*n) + O(1/n^2) ).

For r a nonnegative integer, Sum_{k = r..n} C(k,r)^7*C(n,k)^7 = C(n,r)^7*a(n-r), where we take a(n) = 0 for n < 0. - Peter Bala, Jul 27 2016

MAPLE

a := n -> hypergeom([seq(-n, i=1..7)], [seq(1, i=1..6)], -1):

seq(simplify(a(n)), n=0..15); # Peter Luschny, Jul 27 2016

MATHEMATICA

Table[Total[Binomial[n, Range[0, n]]^7], {n, 0, 20}] (* T. D. Noe, Apr 28 2012 *)

CROSSREFS

Cf. A000079, A000984, A000172, A005260, A005261, A069865, A182422.

Sequence in context: A259109 A190578 A098533 * A218434 A303445 A158110

Adjacent sequences:  A182418 A182419 A182420 * A182422 A182423 A182424

KEYWORD

nonn,easy

AUTHOR

Vaclav Kotesovec, Apr 28 2012

STATUS

approved

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Last modified February 23 21:20 EST 2020. Contains 332195 sequences. (Running on oeis4.)