A180911 Number of sequences of n integers p(i) i=0..n-1 with 0<=p(i)<=6*i and -6<p(i)-p(i-1)<=6.

1, 7, 69, 728, 7996, 89712, 1020651, 11723768, 135611317, 1576988939, 18414581185, 215742738765, 2534467738774, 29840979652015, 352014007477710, 4159154152175656, 49209645681971673, 582929349589746292

Offset

1,2

Comments

Paths down a n-high staggered-grid minimally right-leaning right triangle with interior neighbor fanout 2*6

Column 6 of A180915

Links

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

Crossrefs

Sequence in context: A224758 A219330 A122010 * A386699 A385639 A084774

Adjacent sequences: A180908 A180909 A180910 * A180912 A180913 A180914

Keyword

nonn

Author

R. H. Hardin, Sep 23 2010

Status

approved