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A156922 Third right hand column (n-m=2) of the A156920 triangle 8
1, 15, 129, 877, 5280, 29658, 159742, 838038, 4323003, 22057825, 111750519, 563535483, 2833221970, 14216330916, 71243079660, 356731958812, 1785306330981, 8931761831331, 44675371382365 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

FORMULA

a(n) = 14*a(n-1)-75*a(n-2)+196*a(n-3)-263*a(n-4)+174*a(n-5)-45*a(n-6)

a(n) = (4*n^2-108*n*3^n+24*n-378*3^n+375*5^n+35)/32

G.f.: GF1(z;RHCnr=3) = (1+z-6*z^2)/((1-5*z)*(1-3*z)^2*(1-z)^3)

CROSSREFS

Other columns A000340, A156923, A156924.

Equals A156920 third right hand column.

Equals A156919 third right hand column divided by 4.

Equals A142963 third right hand column divided by 2^n.

Sequence in context: A127595 A056579 A294054 * A271791 A155656 A244878

Adjacent sequences:  A156919 A156920 A156921 * A156923 A156924 A156925

KEYWORD

easy,nonn

AUTHOR

Johannes W. Meijer, Feb 20 2009

STATUS

approved

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Last modified February 20 06:40 EST 2018. Contains 299358 sequences. (Running on oeis4.)