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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 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.)