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, 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

R. H. Hardin, Table of n, a(n) for n=1..100

Crossrefs

Sequence in context: A356468 A276915 A284219 * A268737 A292844 A180905

Adjacent sequences: A180911 A180912 A180913 * A180915 A180916 A180917

Keyword

nonn

Author

R. H. Hardin Sep 23 2010

Status

approved