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A020078 a(n) = floor( Gamma(n+2/7)/Gamma(2/7) ). 7
1, 0, 0, 0, 2, 11, 62, 392, 2862, 23714, 220204, 2264965, 25561751, 314044378, 4172303889, 59604341272, 911094930876, 14837831731419, 256482519928831, 4689966078698628, 90449345803473558, 1834829586299035048 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..445

MAPLE

Digits := 64:f := proc(n, x) trunc(GAMMA(n+x)/GAMMA(x)); end;

seq(floor(pochhammer(2/7, n)), n = 0..25); # G. C. Greubel, Nov 17 2019

MATHEMATICA

Floor[Pochhammer[2/7, Range[0, 25]]] (* G. C. Greubel, Nov 17 2019 *)

PROG

(PARI) vector(26, n, my(x=2/7); gamma(n-1+x)\gamma(x) ) \\ G. C. Greubel, Nov 17 2019

(MAGMA) [Floor(Gamma(n+2/7)/Gamma(2/7)): n in [0..25]]; // G. C. Greubel, Nov 17 2019

(Sage) [floor(rising_factorial(2/7, n)) for n in (0..25)] # G. C. Greubel, Nov 17 2019

CROSSREFS

Cf. A220605.

Cf. A020074, A020075, A020076, A020077, A020079.

Sequence in context: A256933 A162274 A183160 * A002629 A235937 A065928

Adjacent sequences:  A020075 A020076 A020077 * A020079 A020080 A020081

KEYWORD

nonn

AUTHOR

Simon Plouffe

STATUS

approved

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Last modified February 19 09:33 EST 2020. Contains 332041 sequences. (Running on oeis4.)