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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A036407 Ceiling(n^2/9). 0
0, 1, 1, 1, 2, 3, 4, 6, 8, 9, 12, 14, 16, 19, 22, 25, 29, 33, 36, 41, 45, 49, 54, 59, 64, 70, 76, 81, 88, 94, 100, 107, 114, 121, 129, 137, 144, 153, 161, 169, 178, 187, 196, 206, 216, 225, 236, 246, 256, 267, 278, 289, 301, 313, 324, 337, 349 (list; graph; refs; listen; history; internal format)
OFFSET

0,5

FORMULA

a(n)= +2*a(n-1) -a(n-2) +a(n-9) -2*a(n-10) +a(n-11). G.f. -x*(1+x)*(x^8-2*x^7+2*x^6-x^5+x^4-x^3+2*x^2-2*x+1) / ( (1+x+x^2)*(x^6+x^3+1)*(x-1)^3 ). - R. J. Mathar, Jan 22 2011

CROSSREFS

Sequence in context: A018731 A113961 A116621 * A145807 A122380 A033501

Adjacent sequences:  A036404 A036405 A036406 * A036408 A036409 A036410

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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 15 15:20 EST 2012. Contains 205823 sequences.