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A180908 Number of sequences of n integers p(i) i=0..n-1 with 0<=p(i)<=3*i and -3<p(i)-p(i-1)<=3 1
1, 4, 21, 116, 659, 3802, 22146, 129838, 764731, 4519504, 26778943, 158989206, 945437948, 5629314106, 33553133752, 200164459648, 1194964743750, 7138188267650, 42662447719844, 255091414376360, 1525848441256765 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Paths down a n-high staggered-grid minimally right-leaning right triangle with interior neighbor fanout 2*3

Column 3 of A180915

LINKS

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

CROSSREFS

Sequence in context: A255139 A015554 A024051 * A212419 A020048 A318365

Adjacent sequences:  A180905 A180906 A180907 * A180909 A180910 A180911

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 23 2010

STATUS

approved

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Last modified December 13 22:48 EST 2019. Contains 329974 sequences. (Running on oeis4.)