A210946 - OEIS

A210946

Triangle read by rows: T(n,k) = sum of parts in the k-th column of the mirror of the last section of the set of partitions of n with its parts aligned to the right margin.

1, 3, 5, 9, 2, 12, 3, 20, 9, 2, 25, 11, 3, 38, 22, 9, 2, 49, 28, 14, 3, 69, 44, 26, 9, 2, 87, 55, 37, 14, 3, 123, 83, 62, 29, 9, 2, 152

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Row n lists the positive terms of the n-th row of triangle A210953 in decreasing order.

LINKS

Table of n, a(n) for n=1..38.

EXAMPLE

For n = 7 the illustration shows two arrangements of the last section of the set of partitions of 7:

. (7) (7)

. (4+3) (3+4)

. (5+2) (2+5)

. (3+2+2) (2+2+3)

. (1) (1)

. ---------

. 25,11,3

The left hand picture shows the last section of 7 with its parts aligned to the right margin. In the right hand picture (the mirror) we can see that the sum of all parts of the columns 1..3 are 25, 11, 3 therefore row 7 lists 25, 11, 3.

Written as a triangle begins:

9, 2;

12, 3;

20, 9, 2;

25, 11, 3;

38, 22, 9, 2;

49, 28, 14, 3;

69, 44, 26, 9, 2;

87, 55, 37, 14, 3,

123, 83, 62, 29, 9, 2;

CROSSREFS

Column 1 is A046746, n >= 1. Row sums give A138879.

Cf. A135010, A138121, A182703, A194714, A196807, A206437, A207031, A207034, A207035, A210945, A210952, A210953.

Sequence in context: A101298 A296452 A225594 * A319984 A303772 A200510

Adjacent sequences: A210943 A210944 A210945 * A210947 A210948 A210949

KEYWORD

nonn,tabf,more

AUTHOR

Omar E. Pol, Apr 21 2012

STATUS

approved