A038245 Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*3^j.

1, 5, 3, 25, 30, 9, 125, 225, 135, 27, 625, 1500, 1350, 540, 81, 3125, 9375, 11250, 6750, 2025, 243, 15625, 56250, 84375, 67500, 30375, 7290, 729, 78125, 328125, 590625, 590625, 354375, 127575, 25515, 2187, 390625, 1875000, 3937500

Offset

0,2

Comments

Row-reversed A013622. - R. J. Mathar, Dec 21 2011

Links

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

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

Formula

G.f.: 1/(1 - 5*x - 3*x*y). - Ilya Gutkovskiy, Apr 21 2017

Example

1;
5,3;
25,30,9;
125,225,135,27;

Crossrefs

Sequence in context: A354091 A032532 A111108 * A178640 A273153 A288812

Adjacent sequences: A038242 A038243 A038244 * A038246 A038247 A038248

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved