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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089507 Second column of triangle A089504 and second column of array A078741 divided by 18. 3
1, 30, 756, 18360, 441936, 10614240, 254788416, 6115201920, 146766525696, 3522406694400, 84537821131776, 2028908069959680, 48693795855814656, 1168651113600245760, 28047626804770062336, 673143043784666480640 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Convolution of A000400 (powers of 6) with A009968 (powers of 24).

FORMULA

G.f.: 1/((1-3*2*1*x)*(1-4*3*2*x)).

a(n)=A089504(n+2, 2), n>=0. a(n)= (4*(4*3*2)^n - (3*2*1)^n)/3 = (2^n)*(2^(2*(n+1))-1)*3^(n-1).

CROSSREFS

Cf. A089505, A089513-4.

Sequence in context: A166828 A053509 A181201 * A045689 A096722 A176646

Adjacent sequences:  A089504 A089505 A089506 * A089508 A089509 A089510

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Dec 01 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 13 16:02 EST 2012. Contains 205521 sequences.