

A320537


Square array read by antidiagonals in which T(n,k) is the nth even number j with the property that the symmetric representation of sigma(j) has k parts.


1



2, 4, 10, 6, 14, 50, 8, 22, 70, 230, 12, 26, 98, 250, 1150, 16, 34, 110, 290, 1250
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OFFSET

1,1


COMMENTS

This is a permutation of the positive even numbers (A299174).
The union of all oddindexed columns gives A319796, the even numbers in A071562.
The union of all evenindexed columns gives A319802, the even numbers in A071561.
a(21) > 5000.


LINKS

Table of n, a(n) for n=1..20.


EXAMPLE

The corner of the square array begins:
2, 10, 50, 230, 1150, ...
4, 14, 70, 250, 1250, ...
6, 22, 98, 290, ...
8, 26, 110, ...
12, 34, ...
16, ...
...


CROSSREFS

Row 1 is A320521.
Column 1 gives A174973 = A238443, without the 1.
Column 2 gives A244894.
Cf. A000203, A071561, A071562, A236104, A237593, A238443, A239663, A239665, A239929, A240062, A245092, A262626, A299174, A319796, A319802.
Sequence in context: A098556 A159585 A130334 * A331708 A227289 A200742
Adjacent sequences: A320534 A320535 A320536 * A320538 A320539 A320540


KEYWORD

nonn,tabl,more,hard


AUTHOR

Omar E. Pol, Oct 15 2018


STATUS

approved



