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A180909
Number of sequences of n integers p(i) i=0..n-1 with 0<=p(i)<=4*i and -4<p(i)-p(i-1)<=4.
1
1, 5, 34, 245, 1827, 13875, 106612, 825764, 6432933, 50331286, 395107108, 3109826951, 24529022238, 193811775229, 1533585360032, 12149640848560, 96353382257041, 764811311969813, 6075374239940670, 48292524527331788
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OFFSET
1,2
COMMENTS
Paths down a n-high staggered-grid minimally right-leaning right triangle with interior neighbor fanout 2*4
Column 4 of
A180915
LINKS
R. H. Hardin,
Table of n, a(n) for n=1..100
CROSSREFS
Sequence in context:
A033889
A334608
A120469
*
A183415
A066559
A073279
Adjacent sequences:
A180906
A180907
A180908
*
A180910
A180911
A180912
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Sep 23 2010
STATUS
approved
