0,12

N. J. A. Sloane, Challenge Problems: Independent Sets in Graphs

Triangle begins

1

1 1

1 1 1

1 1 1 1

1 2 2 2 1

1 2 3 3 2 1

1 2 4 6 4 2 1

Column k=1 is floor(n/3), column k=2 is A085680, row sums are A057608.

Adjacent sequences: A085681 A085682 A085683 this_sequence A085685 A085686 A085687

Sequence in context: A091237 A143477 A134143 this_sequence A141604 A143996 A071338

nonn,tabl

njas, Jul 17 2003