A004316 a(n) = binomial coefficient C(2n, n-10).

1, 22, 276, 2600, 20475, 142506, 906192, 5379616, 30260340, 163011640, 847660528, 4280561376, 21090682613, 101766230790, 482320623240, 2250829575120, 10363194502115, 47153358767970, 212327989773900, 947309492837400, 4191844505805495, 18412956934908690, 80347448443237920

Offset

10,2

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. 828.

Links

Seiichi Manyama, Table of n, a(n) for n = 10..1000

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

Milan Janjic, Two Enumerative Functions

Milan Janjic and B. Petkovic, A Counting Function, arXiv preprint arXiv:1301.4550, 2013. - From N. J. A. Sloane, Feb 13 2013

Milan Janjic and B. Petkovic, A Counting Function Generalizing Binomial Coefficients and Some Other Classes of Integers, J. Int. Seq. 17 (2014), Article 14.3.5.

Formula

E.g.f.: BesselI(10,2*x)*exp(2*x). - Ilya Gutkovskiy, Jun 27 2019

From Amiram Eldar, Aug 27 2022: (Start)

Sum_{n>=10} 1/a(n) = 59*Pi/(9*sqrt(3)) - 26565167/2450448.

Sum_{n>=10} (-1)^n/a(n) = 1322746*log(phi)/(5*sqrt(5)) - 697534881193/12252240, where phi is the golden ratio (A001622). (End)

Mathematica

Table[Binomial[2*n, n-10], {n, 10, 30}] (* Amiram Eldar, Aug 27 2022 *)

Prog

(Magma) [ Binomial(2*n, n-10): n in [10..150] ]; // Vincenzo Librandi, Apr 13 2011
(PARI) a(n)=binomial(2*n, n-10) \\ Charles R Greathouse IV, Oct 23 2023

Crossrefs

Cf. A001622.

Sequence in context: A023020 A022650 A172226 * A121792 A020922 A258461

Adjacent sequences: A004313 A004314 A004315 * A004317 A004318 A004319

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved