A285066 Triangle read by rows: T(n, m) = A285061(n, m)*m!, 0 <= m <= n.

1, 1, 4, 1, 24, 32, 1, 124, 480, 384, 1, 624, 5312, 10752, 6144, 1, 3124, 52800, 203520, 276480, 122880, 1, 15624, 500192, 3279360, 7956480, 8110080, 2949120, 1, 78124, 4626720, 48633984, 187729920, 329441280, 268369920, 82575360, 1, 390624, 42265472, 687762432, 3969552384, 10672865280, 14615838720, 9909043200, 2642411520, 1, 1953124, 383514240, 9448097280, 78486589440, 303521218560, 621544734720, 696605736960, 404288962560, 95126814720

Offset

0,3

Comments

This is the Sheffer triangle S2[4,1] = A285061 with column m scaled by m!. This is the fourth member of the triangle family A131689, A145901 and A284861.

This triangle appears in the o.g.f. G(n, x) = Sum_{m=0..n} T(n, m)*x^m/(1-x)^(m+1), n >= 0, of the power sequence {(1+4*m)^n}_{m >= 0}.

The diagonal sequence is A047053. The row sums give A285067. The alternating sum of row n is A141413(n+2), n >= 0.

The first column sequences are: A000012, 4*A003463, 2!*4^2*A016234.

Links

Table of n, a(n) for n=0..54.

Wolfdieter Lang, On Sums of Powers of Arithmetic Progressions, and Generalized Stirling, Eulerian and Bernoulli numbers, arXiv:1707.04451 [math.NT], 2017.

Formula

T(n, m) = A285061(n, m)*m! = A111578(n, m)*(4^m*m!), 0 <= m <= n.

T(n, m) = Sum_{k=0..n} binomial(m,k)*(-1)^(k-m)*(1+4*k)^n.

T(n, m) = Sum_{j=0..n} binomial(n-j,m-j)*A225118(n,n-j).

Recurrence: T(n, -1) = 0, T(0, 0) = 1, T(n, m) = 0 if n < m and T(n, m) =

4*m*T(n-1, m-1) + (1+4*m)*T(n-1, m) for n >= 1, m=0..n.

E.g.f. row polynomials R(n, x) = Sum_{m=0..n} T(n, m)*x^m: exp(z)/(1 - x*(exp(4*z) - 1).

E.g.f. column m: exp(x)*(exp(4*x) - 1)^m, m >= 0.

O.g.f. column m: m!*(4*x)^m/Product_{j=0..m} (1 - (1 + 4*j)*x), m >= 0.

Example

The triangle T(n, m) begins:
n\m 0     1       2        3         4         5         6        7
0:  1
1:  1     4
2:  1    24      32
3:  1   124     480      384
4:  1   624    5312    10752      6144
5:  1  3124   52800   203520    276480    122880
6:  1 15624  500192  3279360   7956480   8110080   2949120
7:  1 78124 4626720 48633984 187729920 329441280 268369920 82575360
...
row 8: 1 390624 42265472 687762432 3969552384 10672865280 14615838720 9909043200 2642411520,
row 9: 1 1953124 383514240 9448097280 78486589440 303521218560 621544734720 696605736960 404288962560 95126814720,
row n=10: 1 9765624 3467253152 127427435520 1485441576960 7943677378560 22823127613440 37604818944000 35632919347200 18074094796800 3805072588800.
...

Mathematica

T[n_, m_]:=Sum[Binomial[m, k]*(-1)^(k - m)*(1 + 4k)^n, {k, 0, n}]; Table[T[n, m], {n, 0, 10}, {m, 0, n}] // Flatten (* Indranil Ghosh, May 02 2017 *)

Prog

(Python)
from sympy import binomial
def T(n, m):
    return sum([binomial(m, k)*(-1)**(k - m)*(1 + 4*k)**n for k in range(n + 1)])
for n in range(21):
    print([T(n, m) for m in range(n + 1)])
# Indranil Ghosh, May 02 2017

Crossrefs

Cf. A000012,4*A003463, 32*A016234, A111578 (T(n, m)/4^m), A131689, A141413, A145901, A225118, A225472, A225473, A284861, A285061.

Sequence in context: A136232 A079621 A285061 * A046860 A089505 A300083

Adjacent sequences: A285063 A285064 A285065 * A285067 A285068 A285069

Keyword

nonn,tabl,easy

Author

Wolfdieter Lang, Apr 19 2017

Status

approved