A179380 -id:A179380 - cp's OEIS frontend

A179379 Row sums of the irregular table A179380 related to Bell numbers.

1, 2, 4, 11, 35, 138, 600, 2929, 15339

Offset: 1

Alford Arnold, Jul 12 2010

nonn

			The table has shape A000041 and begins:
1
1 1
2 1 1
6 2 1 1 1
22 6 2 2 1 1 1
so
a(n) begins 1,2,4,11,35,...

A179313 Triangle T(n,k) read by rows: product of the compositorial weight of the k-th partition of n times A074664(.) applied to each part.

Original entry on oeis.org

1, 1, 1, 2, 2, 1, 6, 4, 1, 3, 1, 22, 12, 4, 6, 3, 4, 1, 92, 44, 12, 4, 18, 12, 1, 8, 6, 5, 1, 426, 184, 44, 24, 66, 36, 12, 6, 24, 24, 4, 10, 10, 6, 1, 2146, 852, 184, 88, 36, 276, 132, 72, 18, 12, 88, 72, 24, 24, 1, 30, 40, 10, 12, 15, 7, 1, 11624, 4292, 852, 368, 264, 1278, 552

Offset: 1

Alford Arnold, Jul 11 2010

Row n has A000041(n) entries. T(n,k) is the product of A074664(a_i) over all parts a_i
multiplied by the compositorial weight A048996(n,k) of the k-th partition (Abramowitz-Stegun order)
of n = sum_i a_i.
Summing also over the partitions with a common number of parts would create A127743.
In row n=4, for example, the partitions 3+1 and 2+2, each with 2 parts, are represented by
T(4,2)=4 and T(4,3)= 1 here, and the sum 4+1=5 of the entries is the single entry A127743(4,.).
In this sense, the table is a refinement of A127743.

			T(6,3) represents the 3rd partition of 6, namely 2+4. A074664(2)*A074664(4) = 1*6 is multiplied
by the weight A048996([2,4]) = 2!/1!/1! =2, and T(6,3) =1*6*2=12.
T(6,5) represents the 5th partition of 6, namely 1+1+4. A074664(1)*A074664(1)*A074664(4) = 1*1*6 is multiplied
by the weight A048996([1,1,4]) = 3!/2!/1! =3, and T(6,5) =1*1*6*3.
T(7,6) represents the 6th partition of 7, namely 1+2+4. A074664(1)*A074664(2)*A074664(4) = 1*1*6 is multiplied
the weight A048996([1,2,4]) = 3!/1!/1!/1! =6, and T(7,6) =1*1*6*6.
The triangle starts
1;
1,1;
2,2,1;
6,4,1,3,1;
22,12,4,6,3,4,1;
92,44,12,4,18,12,1,8,6,5,1;
426,184,44,24,66,36,12,6,24,24,4,10,10,6,1;

M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions, p. 831

Cf. A000041, A127743

T(n,k) = A048996(n,k) * A179380(n,k).

sum_{k=1..A000041(n)} T(n,k) = A000110(n).

Edited and extended by R. J. Mathar, Jul 16 2010

cp's OEIS Frontend

A179379 Row sums of the irregular table A179380 related to Bell numbers.

Views

Author

Keywords

Examples

A179313 Triangle T(n,k) read by rows: product of the compositorial weight of the k-th partition of n times A074664(.) applied to each part.

Views

Author

Keywords

Comments

Examples

References

Crossrefs

Formula

Extensions