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A180914
Number of sequences of n integers p(i) i=0..n-1 with 0<=p(i)<=9*i and -9<p(i)-p(i-1)<=9
1
1, 10, 144, 2240, 36402, 605600, 10231704, 174721408, 3007128087, 52066422332, 905751324518, 15816420350420, 277052021262480, 4865694946445860, 85641691341319812, 1510236415306298800, 26675550244540566147
OFFSET
1,2
COMMENTS
Paths down a n-high staggered-grid minimally right-leaning right triangle with interior neighbor fanout 2*9
Column 9 of A180915
LINKS
CROSSREFS
Sequence in context: A356468 A276915 A284219 * A268737 A292844 A180905
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 23 2010
STATUS
approved