The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A136660 Unsigned fourth column (k=3) of triangle A136656 divided by 8. 3

%I

%S 1,18,255,3465,47880,687960,10372320,164656800,2754259200,48518870400,

%T 899026128000,17495593315200,356995102464000,7625049239808000,

%U 170196434343936000,3963602854987776000,96160451873181696000

%N Unsigned fourth column (k=3) of triangle A136656 divided by 8.

%C Also unsigned third column of triangle A136657 divided by 4.

%D Ch. A. Charalambides, Enumerative Combinatorics, Chapman & Hall/CRC, Boca Raton, Florida, 2002, Table 8.3, p. 311, with s=-2, k=3 column/8.

%F a(n)= |A136656(n+3,3)|/8, n>=0.

%F E.g.f.(derived from the one given for the column k=3 under A136656): (2+18*x+3*x^2-12*x^3+3*x^4)/(2*(1-x)^9).

%Y Cf. A136659 (column k=2), A136661 (column k=4).

%K nonn,easy

%O 0,2

%A _Wolfdieter Lang_ Feb 22 2008

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.

Last modified June 6 04:15 EDT 2020. Contains 334859 sequences. (Running on oeis4.)