The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A129398 Pyramid P(h,x,y)=P(h,x,y-1)+P(h,x,y+1)+P(h,x-1,y)+P(h,x+1,y)+P(h-1,x,y), read level by level, x by x. 2
 1, 1, 1, 5, 1, 1, 1, 1, -3, 1, 1, -3, -7, -3, 1, 1, -3, 1, 1, 1, 1, 4, 1, 1, 3, 0, 3, 1, 1, 4, 0, -7, 0, 4, 1, 1, 3, 0, 3, 1, 1, 4, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS All face elements=1. For an element x on a level inside the pyramid ..b .cxd ..e with a above x, x=a+b+c+d+e. Every level of the pyramid is symmetric. Thus the top (h=0) of the pyramid is 1. The level h=1 is ..1 .1.5.1 ..1 The level h=2 is .....1 ..1.-3..1 1.-3.-7.-3..1 ..1.-3..1 .....1 The level h=3 is ........1 .....1..4..1 ..1..3..0..3..1 1..4..0.-7..0..4..1 ..1..3..0..3..1 .....1..4..1 ........1 LINKS Table of n, a(n) for n=0..43. CROSSREFS This is a three-dimensional analog of A129392. Cf. A129392, A129399. Sequence in context: A188796 A161685 A257461 * A109009 A060904 A351084 Adjacent sequences: A129395 A129396 A129397 * A129399 A129400 A129401 KEYWORD sign AUTHOR Jonas Wallgren, Apr 13 2007 STATUS approved

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

Last modified August 13 14:18 EDT 2024. Contains 375142 sequences. (Running on oeis4.)