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A057607 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)). 2
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; text; internal format)
OFFSET

2,1

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.

LINKS

Reinhard Zumkeller, Rows n = 2..15 of triangle, flattened

N. J. A. Sloane, On single-deletion-correcting codes

EXAMPLE

2; 0,2,6; 0,2,4,6,4; 0,2,4,8,4,8,4,2,0; ...

PROG

(Haskell)

a057607 n k = a057607_tabf !! (n-2) !! k

a057607_row n = a057607_tabf !! (n-2)

a057607_tabf =  [2] : map (0 :) a057606_tabf

-- Reinhard Zumkeller, Apr 30 2012

CROSSREFS

Cf. A057606.

Sequence in context: A033739 A033733 A115951 * A264954 A212085 A265882

Adjacent sequences:  A057604 A057605 A057606 * A057608 A057609 A057610

KEYWORD

nonn,tabf,nice

AUTHOR

N. J. A. Sloane, Oct 08 2000

STATUS

approved

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Last modified May 21 05:37 EDT 2022. Contains 353889 sequences. (Running on oeis4.)