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A057607
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Triangle T(n,k) = number of binary n-tuples u having exactly k grandchildren, where a grandchild is a vector obtained by deleting any two coordinates of u (n >= 2, 0<=k<=2^(n-2)).
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1
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2, 0, 2, 6, 0, 2, 4, 6, 4, 0, 2, 4, 8, 4, 8, 4, 2, 0, 0, 2, 4, 10, 6, 12, 8, 8, 6, 6, 0, 2, 0, 0, 0, 0, 0, 0, 2, 4, 12, 8, 16, 14, 16, 12, 12, 12, 6, 4, 8, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 14, 10, 20, 22, 24, 22, 22, 26, 18, 16, 12, 16, 12, 0, 4, 10, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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REFERENCES
| N. J. A. Sloane, On single-deletion-correcting codes, in Codes and Designs (Columbus, OH, 2000), 273-291, Ohio State Univ. Math. Res. Inst. Publ., 10, de Gruyter, Berlin, 2002.
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LINKS
| N. J. A. Sloane, On single-deletion-correcting codes
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EXAMPLE
| 2; 0,2,6; 0,2,4,6,4; 0,2,4,8,4,8,4,2,0; ...
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CROSSREFS
| Cf. A057606.
Sequence in context: A033739 A033733 A115951 * A186634 A139213 A033727
Adjacent sequences: A057604 A057605 A057606 * A057608 A057609 A057610
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KEYWORD
| nonn,tabf,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Oct 08 2000
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