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A051357 Chernoff sequence A006939 divided by 2. 2
1, 6, 180, 37800, 87318000, 2622159540000, 1338638666765400000, 12984380089637682726000000, 2896722619368127899492763620000000, 18740906719713843949122453226304292600000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..37

FORMULA

a(n) = Product_{k=1..n} prime(k)^(n-k+1) / 2.

MATHEMATICA

Table[Product[Prime[k]^(n - k + 1), {k, 1, n}]/2, {n, 1, 15}] (* G. C. Greubel, Oct 14 2018 *)

PROG

(PARI) for(n=1, 15, print1(prod(k=1, n, prime(k)^(n-k+1))/2, ", ")) \\ G. C. Greubel, Oct 14 2018

(MAGMA) [(&*[NthPrime(k)^(n-k+1): k in [1..n]])/2: n in [1..15]]; // G. C. Greubel, Oct 14 2018

CROSSREFS

Sequence in context: A141121 A176730 A225776 * A251671 A064120 A041429

Adjacent sequences:  A051354 A051355 A051356 * A051358 A051359 A051360

KEYWORD

easy,nonn

AUTHOR

Judson D. Neer (judson(AT)poboxes.com)

STATUS

approved

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Last modified November 16 21:47 EST 2018. Contains 317275 sequences. (Running on oeis4.)