A288148 Number of (undirected) paths in the n-triangular grid graph.

0, 6, 108, 2598, 123750, 12994248, 3114709914, 1730766715308, 2248937669398650, 6877862090075063484, 49790967547432817528562, 857275977287938332061154856, 35233501393224883314185777947590

Offset: 0

Author

Eric W. Weisstein, Jun 05 2017

Keywords

• nonn
• more

Comments

Paths of length zero are not counted here.

Examples

			a(1) = 6:
:    o    :    o    :    o    :    o    :    o    :    o
:         :   /     :     \   :   / \   :     \   :   /
:  o---o  :  o   o  :  o   o  :  o   o  :  o---o  :  o---o  .
		

Links

• Eric Weisstein's World of Mathematics, Graph Path
• Eric Weisstein's World of Mathematics, Triangular Grid Graph

Crossrefs

Cf. A020874, A266513, A112675, A112676.

Extensions

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