0,4

Difference array begins:

1 1 1 2 1 3 1 5 1 7 1 11

.. 0 0 1 -1 2 -2 4 -4 6 -6 10

..... 0 1 -2 3 -4 6 -8 10 -12 16

........ 1 -3 5 -7 10 -14 18 -22 28

Adjacent sequences: A130005 A130006 A130007 this_sequence A130009 A130010 A130011

Sequence in context: A133021 A131208 A119479 this_sequence A101809 A127203 A126132

nonn

Paul Curtz (bpcrtz(AT)free.fr), Jun 15 2007