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A157321 Symmetrical Hahn weights on q-form factorials:m=2;q=3; q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]]; Hahn weight:b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])]. 0
1, 126, 126, 312, 882, 312, 630, 3276, 3276, 630, 1116, 8820, 16224, 8820, 1116, 1806, 19530, 54600, 54600, 19530, 1806, 2736, 37926, 145080, 220500, 145080, 37926, 2736, 3942, 67032, 328692, 683550, 683550, 328692, 67032, 3942, 5460, 110376 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums are:

{1, 252, 1506, 7812, 36096, 151872, 591984, 2166432, 7521024, 24970752,

79801344,...}.

These are Rhombi sides as ratios of q-form to factorial:

r1=t(1,n)/n!;

r2=t(m+1,k]/(n-k)!;

r3=t(m+1,n-k)/(n-k)!

They get very large very fast, but all are integer.

LINKS

Table of n, a(n) for n=0..37.

FORMULA

m=2;q=3;

q-form:t(n,m)=If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]];

Hahn weight:

b(n,k,m)=If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[1, n])].

EXAMPLE

{1},

{126, 126},

{312, 882, 312},

{630, 3276, 3276, 630},

{1116, 8820, 16224, 8820, 1116},

{1806, 19530, 54600, 54600, 19530, 1806},

{2736, 37926, 145080, 220500, 145080, 37926, 2736},

{3942, 67032, 328692, 683550, 683550, 328692, 67032, 3942},

{5460, 110376, 663936, 1769880, 2421720, 1769880, 663936, 110376, 5460},

{7326, 171990, 1229904, 4021920, 7054236, 7054236, 4021920, 1229904, 171990, 7326},

{9576, 256410, 2129400, 8278200, 17811360, 22831452, 17811360, 8278200, 2129400, 256410, 9576}

MATHEMATICA

Clear[t, n, m, i, k, a, b];

t[n_, m_] = If[m == 0, n!, Product[Sum[(m + 1)^i, {i, 0, k - 1}], {k, 1, n}]];

b[n_, k_, m_] = If[n == 0, 1, (n!*t[m + 1, k]*t[m + 1, n - k])/(k!*(n - k)!*t[ 1, n])];

Table[Flatten[Table[Table[b[n, k, m], {k, 0, n}], {n, 0, 10}]], {m, 0, 15}]

CROSSREFS

Sequence in context: A278935 A267395 A176303 * A100730 A044876 A080539

Adjacent sequences:  A157318 A157319 A157320 * A157322 A157323 A157324

KEYWORD

nonn,tabl,uned

AUTHOR

Roger L. Bagula, Feb 26 2009

STATUS

approved

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Last modified June 23 07:38 EDT 2021. Contains 345395 sequences. (Running on oeis4.)