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A288148 Number of (undirected) paths in the n-triangular grid graph. 4
0, 6, 108, 2598, 123750, 12994248, 3114709914, 1730766715308, 2248937669398650, 6877862090075063484, 49790967547432817528562, 857275977287938332061154856, 35233501393224883314185777947590 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Paths of length zero are not counted here.

LINKS

Table of n, a(n) for n=0..12.

Eric Weisstein's World of Mathematics, Graph Path

Eric Weisstein's World of Mathematics, Triangular Grid Graph

EXAMPLE

a(1) = 6:

: o : o : o : o : o : o

: : / : \ : / \ : \ : /

: o---o : o o : o o : o o : o---o : o---o .

CROSSREFS

Cf. A020874, A266513, A112675, A112676.

Sequence in context: A230540 A295791 A055532 * A010563 A114310 A221954

Adjacent sequences: A288145 A288146 A288147 * A288149 A288150 A288151

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Jun 05 2017

EXTENSIONS

a(7)-a(12) from Andrew Howroyd, Jun 07 2017

STATUS

approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)