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A038303 Triangle whose (i,j)-th entry is binomial(i,j)*10^(i-j)*1^j. 4
1, 10, 1, 100, 20, 1, 1000, 300, 30, 1, 10000, 4000, 600, 40, 1, 100000, 50000, 10000, 1000, 50, 1, 1000000, 600000, 150000, 20000, 1500, 60, 1, 10000000, 7000000, 2100000, 350000, 35000, 2100, 70, 1, 100000000, 80000000, 28000000 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

T(i,j) is the number of i-permutations of 11 objects a,b,c,d,e,f,g,h,i,j,k, with repetition allowed, containing j a's. - Zerinvary Lajos, Dec 21 2007

Triangle T(n,k), read by rows, given by [10,0,0,0,0,0,0,0,...] DELTA [1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938. - Philippe Deléham, Dec 15 2009

REFERENCES

B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

LINKS

Table of n, a(n) for n=0..38.

FORMULA

Sum_{k, 0<=k<=n} T(n,k)*x^k = (10+x)^n. - Philippe Deléham, Dec 15 2009

G.f.: -1/(-1+10*x+x*y). - R. J. Mathar, Aug 11 2015

EXAMPLE

1

10, 1

100, 20, 1

1000, 300, 30, 1

10000, 4000, 600, 40, 1

100000, 50000, 10000, 1000, 50, 1

1000000, 600000, 150000, 20000, 1500, 60, 1

10000000, 7000000, 2100000, 350000, 35000, 2100, 70, 1

100000000, 80000000, 28000000, 5600000, 700000, 56000, 2800, 80, 1

MAPLE

for i from 0 to 8 do seq(binomial(i, j)*10^(i-j), j = 0 .. i) od; # Zerinvary Lajos, Dec 21 2007

CROSSREFS

Sequence in context: A164881 A276379 A165293 * A178870 A075505 A130310

Adjacent sequences:  A038300 A038301 A038302 * A038304 A038305 A038306

KEYWORD

nonn,tabl,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified February 23 17:41 EST 2018. Contains 299584 sequences. (Running on oeis4.)