A219562 -id:A219562 - cp's OEIS frontend

A112029 a(n) = Sum_{k=0..n} binomial(n+k, k)^2.

1, 5, 46, 517, 6376, 82994, 1119210, 15475205, 217994860, 3115374880, 45035696036, 657153097330, 9663914317396, 143050882063262, 2129448324373546, 31853280798384645, 478503774600509620, 7215090439396842572, 109154411037070011504, 1656268648035559711392

Offset: 0

N. J. A. Sloane, Nov 28 2005

Vincenzo Librandi, Table of n, a(n) for n = 0..200
F. Baldassarri, S. Bosch, B. Dwork, (eds), p-adic Analysis. Lecture Notes in Mathematics, vol. 1454, pp. 194 - 204, Springer, Berlin, Heidelberg.
Matthijs J. Coster, Supercongruences.
C. Elsner, On recurrence formulas for sums involving binomial coefficients, Fib. Q., 43,1 (2005), 31-45.
Vaclav Kotesovec, Asymptotic of generalized Apery sequences with powers of binomial coefficients, Nov 04 2012
Pedro J. Miana, Hideyuki Ohtsuka, and Natalia Romero, Sums of powers of Catalan triangle numbers, arXiv:1602.04347 [math.NT], 2016.

Cf. A001700, A110197, A112028, A173774, A176335, A219562, A219563, A219564, A333592.

[(&+[Binomial(n+j, j)^2: j in [0..n]]): n in [0..20]]; // G. C. Greubel, Jul 06 2021

f := 64*x^2/(16*x-1); S := sqrt(x)*sqrt(4-x);
H := ((10*x-5/8)*hypergeom([1/4,1/4],[1],f)-(21*x-21/8)*hypergeom([1/4,5/4],[1],f))/(S*(1-16*x)^(5/4));
ord := 30;
ogf := series(int(series(H,x=0,ord),x)/S,x=0,ord);
# Mark van Hoeij, Mar 27 2013

Table[Sum[Binomial[n+k,k]^2, {k,0,n}], {n,0,20}] (* Vaclav Kotesovec, Nov 23 2012 *)

a(n) = sum(k=0, n, binomial(n+k, k)^2); \\ Michel Marcus, Jul 07 2021

[sum(binomial(n+j, j)^2 for j in (0..n)) for n in (0..20)] # G. C. Greubel, Jul 06 2021

a(n) ~ 2^(4*n+2)/(3*Pi*n). - Vaclav Kotesovec, Nov 23 2012
Recurrence: 2*(2*n+1)*(21*n-13)*n^2*a(n) = (1365*n^4 - 1517*n^3 + 240*n^2 + 216*n - 64)*a(n-1) - 4*(n-1)*(2*n-1)^2*(21*n+8)*a(n-2). - Vaclav Kotesovec, Nov 23 2012
G.f.: see Maple code. - Mark van Hoeij, Mar 27 2013
a(p-1) == 1 (mod p^3) for all primes p >= 5. See the comments in A173774. - Peter Bala, Jul 12 2024
a(n-1) = 1/(4*n) * binomial(2*n, n)^2 * ( 1 + 3*((n - 1)/(n + 1))^3 + 5*((n - 1)*(n - 2)/((n + 1)*(n + 2)))^3 + 7*((n - 1)*(n - 2)*(n - 3)/((n + 1)*(n + 2)*(n + 3)))^3 + ... )  for n >= 1. - Peter Bala, Jul 22 2024
a(m*p^r - 1) == a(m*p^(r-1) - 1) (mod p^(3*r)) for all primes p >= 5 and positive integers m and r. See Coster, Theorem 4. - Peter Bala, Nov 29 2024
a(n) = A110197(2n,n). - Alois P. Heinz, Mar 21 2025

A112028 a(n) = Sum_{k=0..n} binomial(n+k,k)^3.

Original entry on oeis.org

1, 9, 244, 9065, 389376, 18188478, 897376152, 46011772521, 2427553965160, 130930630643384, 7186614533569296, 400132290102421214, 22543708920891189136, 1282873288801683197250, 73628947696550668509744, 4257138240245923453355625, 247733479854085081062353400

Offset: 0

N. J. A. Sloane, Nov 28 2005

M.J. Coster: Supercongruences, [Thesis] Univ. of Leiden, the Netherlands, 1988.

Vincenzo Librandi, Table of n, a(n) for n = 0..200
F. Baldassarri, S. Bosch, B. Dwork, (eds), p-adic Analysis. Lecture Notes in Mathematics, vol. 1454, pp. 194 - 204, Springer, Berlin, Heidelberg.
Matthijs Coster, Supercongruences.
C. Elsner, On recurrence formulas for sums involving binomial coefficients, Fib. Q., 43,1 (2005), 31-45.
Vaclav Kotesovec, Asymptotic of generalized Apery sequences with powers of binomial coefficients, Nov 04 2012

Cf. A001700, A112029, A219562, A219563, A219564.

A375178 is an essentially identical sequence.

y2 := hypergeom([2/3, 2/3],[4/3],-x^2/27)*x^(1/3);
h := hypergeom([1/4, 1/4],[1],64*x)^2;
H := (243+247*x)*x*diff(h,x,x) + (463*x+234)*diff(h,x) + (48-24/x)*h;
ogf := y2*Int(Int(y2*H,x)/(8*x*(x^2+27)*y2^2),x);
# Check ogf by computing a series expansion:
SER := proc(a, x) series(a, x, 20) end:
INT := proc(a, x) int(SER(a, x), x) end:
SER(eval(ogf, Int = INT), x); # Mark van Hoeij, Apr 04 2013

Table[Sum[Binomial[n+k,k]^3,{k,0,n}],{n,0,20}] (* Harvey P. Dale, Sep 24 2012 *)

a(n) = sum(k=0, n, binomial(n+k, k)^3); \\ Michel Marcus, Mar 09 2016

a(n) ~ 2^(6*n+3)/(7*(Pi*n)^(3/2)). - Vaclav Kotesovec, Nov 23 2012
Recurrence: 3*(3*n-1)*(3*n+1)*(15799*n^5 - 103177*n^4 + 265789*n^3 - 336367*n^2 + 208000*n - 49852)*n^3*a(n) = 24*(2*n-3)^3*(3*n-4)*(3*n-2)*(15799*n^5 - 24182*n^4 + 11071*n^3 - 72*n^2 - 1080*n + 192)*a(n-1) - (n-1)^2*(15799*n^5 - 103177*n^4 + 265789*n^3 - 336367*n^2 + 208000*n - 49852)*n^3*a(n-2) + 8*(n-2)^2*(2*n-3)^3*(15799*n^5 - 24182*n^4 + 11071*n^3 - 72*n^2 - 1080*n + 192)*a(n-3). - Vaclav Kotesovec, Nov 23 2012
O.g.f. can be expressed in terms of hypergeometric functions (see Maple program). - Mark van Hoeij, Apr 01 2013
From Peter Bala, Mar 29 2023: (Start)
The supercongruence a(p-1) == 1 (mod p^5) appears to hold for all primes p >= 7 (checked up to p = 199). Coster, Theorem 4, proves that a(p-1) == 1 (mod p^3) for primes p >= 5.
For r >= 2, the supercongruence a(p^r - 1) == a(p^(r-1) - 1) (mod p^(3*r+3)) may hold for all primes p >= 7. (End)

A219563 Sum(binomial(n+k,k)^5, k=0..n).

Original entry on oeis.org

1, 33, 8020, 3301025, 1733984376, 1048567813062, 694995078406056, 491336887915201185, 364377975224032162000, 280380150421755638519408, 222165159124597435189467696, 180288439972217748901049985158, 149230751849318301857448761484400, 125602423480863080624602495191566250

Offset: 0

Vaclav Kotesovec, Nov 23 2012

nonn

Vincenzo Librandi, Table of n, a(n) for n = 0..200
V. Kotesovec, Asymptotic of generalized Apery sequences with powers of binomial coefficients, Nov 04 2012

Cf. A001700, A112029, A112028, A219562, A219564.

Table[Sum[Binomial[n+k,k]^5, {k,0,n}], {n,0,20}]

a(n) ~ 2^(10*n+5)/(31*(Pi*n)^(5/2)).

A219564 Sum(binomial(n+k,k)^6, k=0..n).

Original entry on oeis.org

1, 65, 47386, 65004097, 119498671876, 260128695981674, 632156164654144530, 1659900189891175027265, 4616088190888638302435080, 13418259230056806455830305940, 40401802613222456104862752944356, 125182282922559710456869140648653290, 397195659937314116991934285462527257236

Offset: 0

Vaclav Kotesovec, Nov 23 2012

nonn

Vincenzo Librandi, Table of n, a(n) for n = 0..200
V. Kotesovec, Asymptotic of generalized Apery sequences with powers of binomial coefficients, Nov 04 2012

Cf. A001700 (q=1), A112029 (q=2), A112028 (q=3), A219562 (q=4), A219563 (q=5).

Table[Sum[Binomial[n+k,k]^6, {k,0,n}], {n,0,20}]

a(n) ~ 2^(12*n+6)/(63*Pi^3*n^3)

Generally (for q > 0), Sum_{k=0..n} C(n + k,k)^q is asymptotic to 2^((2*n+1)*q)/((2^q-1)*(Pi*n)^(q/2)) * (1 - q/(2*n)*(1/4+1/(2^q-1)^2) + O(1/n^2))

A295612 a(n) = Sum_{k=0..n} binomial(n+k,k)^k.

Original entry on oeis.org

1, 3, 40, 8105, 24053106, 1016507243472, 622366942086680904, 5608321882919220905812521, 752711651805019773658037206391596, 1518219710649896586598445898967340890577318, 46343146356260529633020448755386347142785083052620084

Offset: 0

Ilya Gutkovskiy, Nov 24 2017

nonn

Seiichi Manyama, Table of n, a(n) for n = 0..41
Eric Weisstein's World of Mathematics, Binomial Sums

Cf. A001700, A046899, A112028, A112029, A167008, A219562, A219563, A219564.

Table[Sum[Binomial[n + k, k]^k, {k, 0, n}], {n, 0, 10}]
Table[Sum[((n + k)!/(n! k!))^k, {k, 0, n}], {n, 0, 10}]

a(n) = sum(k=0, n, binomial(n+k,k)^k); \\ Michel Marcus, Nov 25 2017

a(n) = Sum_{k=0..n} A046899(n,k)^k.

a(n) ~ 2^(2*n^2) / (exp(1/8) * Pi^(n/2) * n^(n/2)). - Vaclav Kotesovec, Nov 25 2017

A336829 a(n) = Sum_{k=0..n} binomial(n+k,k)^n.

Original entry on oeis.org

1, 3, 46, 9065, 25561876, 1048567813062, 632156164654144530, 5652307059542612442465921, 755658094192422806457805924637704, 1521188219372604726826961340683399629967888, 46388428590466766659538640978460161019178279424832676

Offset: 0

Ilya Gutkovskiy, Aug 05 2020

nonn

Seiichi Manyama, Table of n, a(n) for n = 0..41

Cf. A001700, A112028, A112029, A167010, A219562, A219563, A219564.

[(&+[Binomial(2*n-j,n)^n: j in [0..n]]): n in [0..20]]; // G. C. Greubel, Aug 31 2022

Table[Sum[Binomial[n + k, k]^n, {k, 0, n}], {n, 0, 10}]

a(n) = sum(k=0, n, binomial(n+k, k)^n); \\ Michel Marcus, Aug 05 2020

def A336829(n): return sum(binomial(2*n-j, n)^n for j in (0..n))
[A336829(n) for n in (0..20)] # G. C. Greubel, Aug 31 2022

a(n) ~ exp(-1/8) * 2^(2*n^2) / (Pi*n)^(n/2). - Vaclav Kotesovec, Jul 10 2021

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A112029 a(n) = Sum_{k=0..n} binomial(n+k, k)^2.

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A112028 a(n) = Sum_{k=0..n} binomial(n+k,k)^3.

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A219563 Sum(binomial(n+k,k)^5, k=0..n).

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A219564 Sum(binomial(n+k,k)^6, k=0..n).

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A295612 a(n) = Sum_{k=0..n} binomial(n+k,k)^k.

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A336829 a(n) = Sum_{k=0..n} binomial(n+k,k)^n.

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Magma

Mathematica

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