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A054334 1/512 of eleventh unsigned column of triangle A053120 (T-Chebyshev, rising powers, zeros omitted). +0
5
1, 12, 77, 352, 1287, 4004, 11011, 27456, 63206, 136136, 277134, 537472, 999362, 1790712, 3105322, 5230016, 8580495, 13748020, 21559395, 33153120, 50075025, 74397180, 108864405, 157073280, 223689180, 314707536, 437766252, 602516992 (list; graph; listen)
OFFSET

0,2

COMMENT

Partial sums of A054333.

If a 2-set Y and an (n-3)-set Z are disjoint subsets of an n-set X then a(n-11) is the number of 11-subsets of X intersecting both Y and Z. - Milan R. Janjic (agnus(AT)blic.net), Sep 08 2007

REFERENCES

M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 795.

Theodore J. Rivlin, Chebyshev polynomials: from approximation theory to algebra and number theory, 2. ed., Wiley, New York, 1990.

LINKS

Milan Janjic, Two Enumerative Functions

M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, December 1972 [alternative scanned copy].

Index entries for sequences related to Chebyshev polynomials.

FORMULA

a(n) = (2*n+10)*binomial(n+9, 9)/10 = ((-1)^n)*A053120(2*n+10, 10)/2^9.

G.f. (1+x)/(1-x)^11.

a(n)=2*C(n+10, 10)-C(n+9, 9). - Paul Barry (pbarry(AT)wit.ie), Mar 04 2003

CROSSREFS

Cf. A053120, A054333.

Sequence in context: A009405 A009839 A071767 this_sequence A026964 A026974 A109711

Adjacent sequences: A054331 A054332 A054333 this_sequence A054335 A054336 A054337

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.


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