A140880 - OEIS

A140880

Triangle read by rows, T(n,k) = Gamma(n+3)/(Gamma(k+1)*Gamma(n-k+1)) for n>=0 and 0<=k<=n.

2, 6, 6, 12, 24, 12, 20, 60, 60, 20, 30, 120, 180, 120, 30, 42, 210, 420, 420, 210, 42, 56, 336, 840, 1120, 840, 336, 56, 72, 504, 1512, 2520, 2520, 1512, 504, 72, 90, 720, 2520, 5040, 6300, 5040, 2520, 720, 90

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..44.

EXAMPLE

Triangle starts:

[0] 2

[1] 6, 6

[2] 12, 24, 12

[3] 20, 60, 60, 20

[4] 30, 120, 180, 120, 30

[5] 42, 210, 420, 420, 210, 42

[6] 56, 336, 840, 1120, 840, 336, 56

[7] 72, 504, 1512, 2520, 2520, 1512, 504, 72

[8] 90, 720, 2520, 5040, 6300, 5040, 2520, 720, 90

MAPLE

T := (n, k) -> GAMMA(n+3)/(GAMMA(k+1)*GAMMA(n-k+1)):

seq(seq(T(n, k), k=0..n), n=0..8); # Peter Luschny, Oct 29 2017

MATHEMATICA

Flatten[Table[Gamma[n+3]/(Gamma[k+1]Gamma[n-k+1]), {n, 0, 8}, {k, 0, n}]]

CROSSREFS

T(n,0) = T(n,n) = A002378(n+1). T(n,k) = 2*A094305(n,k).

Row sums are A001815(n+2).

Cf. A007318.

Sequence in context: A253215 A075779 A241301 * A065420 A119312 A309415

Adjacent sequences: A140877 A140878 A140879 * A140881 A140882 A140883

KEYWORD

nonn,tabl

AUTHOR

Roger L. Bagula and Gary W. Adamson, Jul 22 2008

EXTENSIONS

Edited and new name from Peter Luschny, Oct 29 2017

STATUS

approved