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 A063001 Number of paths of length n+2 originating at a non-corner edge of 4 X 4 Boggle board. 2
 5, 24, 109, 435, 1512, 4621, 12463, 29565, 60596, 104542, 147032, 161759, 130777, 68989, 17681 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A legal walk on a Boggle board is from one vertex to a vertex adjacent orthogonally or diagonally. LINKS Eugene McDonnell, Remarks on Game of "Boggle" FORMULA Formula unknown, values computed empirically. PROG (Python) def nn(c): # neighbors of c   i, j = divmod(c, 4)   N = set((i+io, j+jo) for io in [-1, 0, 1] for jo in [-1, 0, 1]) - {(i, j)}   return [4*i+j for i, j in N if 0 <= i < 4 and 0 <= j < 4] def afind():   n, paths = 0, {(1, )}   while n+2 <= 16:     paths1 = set(p + (e, ) for p in paths for e in nn(p[-1]) if e not in p)     print(len(paths1), end=", ")     n, paths = n+1, paths1 afind() # Michael S. Branicky, May 24 2021 CROSSREFS Cf. A063000, A063002. Sequence in context: A270186 A008464 A291010 * A000953 A183934 A171310 Adjacent sequences:  A062998 A062999 A063000 * A063002 A063003 A063004 KEYWORD fini,full,nonn AUTHOR Eugene McDonnell (EEMcD(AT)AOL.com), Jul 01 2001 STATUS approved

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Last modified August 3 04:47 EDT 2021. Contains 346435 sequences. (Running on oeis4.)