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 A082693 Pyramidal sequence built with powers of 2. 3
 1, 2, 1, 2, 4, 2, 1, 2, 4, 8, 4, 2, 1, 2, 4, 8, 16, 8, 4, 2, 1, 2, 4, 8, 16, 32, 16, 8, 4, 2, 1, 2, 4, 8, 16, 32, 64, 32, 16, 8, 4, 2, 1, 2, 4, 8, 16, 32, 64, 128, 64, 32, 16, 8, 4, 2, 1, 2, 4, 8, 16, 32, 64, 128, 256, 128, 64, 32, 16, 8, 4, 2, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 256, 128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE Triangle begins:                                  1                                2 1 2                              4 2 1 2 4                            8 4 2 1 2 4 8                         16 8 4 2 1 2 4 8 16                      32 16 8 4 2 1 2 4 8 16 32                   64 32 16 8 4 2 1 2 4 8 16 32 64               128 64 32 16 8 4 2 1 2 4 8 16 32 64 128           256 128 64 32 16 8 4 2 1 2 4 8 16 32 64 128 256       512 256 128 64 32 16 8 4 2 1 2 4 8 16 32 64 128 256 512 1024 512 256 128 64 32 16 8 4 2 1 2 4 8 16 32 64 128 256 512 1024 ... - Philippe Deléham, Mar 20 2013 MATHEMATICA pow2Pyram[row_] := Module[{st = 2^Range[0, row]}, Join[st, Reverse[Most[Rest[st]]]]]; Flatten[Array[pow2Pyram, 10]] (* Harvey P. Dale, May 09 2012 *) Flatten[Table[Table[2^Abs[col], {col, -row, row}], {row, 0, 7}]] (* Alonso del Arte, Apr 15 2017 *) PROG (PARI) for(i=0, 9, forstep(j=i, 0, -1, print1(1<

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Last modified June 18 04:41 EDT 2021. Contains 345098 sequences. (Running on oeis4.)