login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A038299 Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*9^j. 2

%I

%S 1,9,9,81,162,81,729,2187,2187,729,6561,26244,39366,26244,6561,59049,

%T 295245,590490,590490,295245,59049,531441,3188646,7971615,10628820,

%U 7971615,3188646,531441,4782969,33480783,100442349,167403915

%N Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*9^j.

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

%F Row sums: sum_{j=0..i} T(i,j) = A001027(i). [From _R. J. Mathar_, Mar 30 2009]

%K nonn,tabl,easy

%O 0,2

%A _N. J. A. Sloane_.

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 15 06:30 EST 2019. Contains 329144 sequences. (Running on oeis4.)