A245093 - OEIS

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A245093

Triangle read by rows in which row n lists the first n terms of A000203.

1, 1, 3, 1, 3, 4, 1, 3, 4, 7, 1, 3, 4, 7, 6, 1, 3, 4, 7, 6, 12, 1, 3, 4, 7, 6, 12, 8, 1, 3, 4, 7, 6, 12, 8, 15, 1, 3, 4, 7, 6, 12, 8, 15, 13, 1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28

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

OFFSET

1,3

COMMENTS

Reluctant sequence of A000203.

Row sums give A024916.

Has a symmetric representation - for more information see A237270.

LINKS

Reinhard Zumkeller, Rows n = 1..125 of triangle, flattened

FORMULA

T(n,k) = A000203(k), 1<=k<=n.

EXAMPLE

Triangle begins:

1, 3;

1, 3, 4;

1, 3, 4, 7;

1, 3, 4, 7, 6;

1, 3, 4, 7, 6, 12;

1, 3, 4, 7, 6, 12, 8;

1, 3, 4, 7, 6, 12, 8, 15;

1, 3, 4, 7, 6, 12, 8, 15, 13;

1, 3, 4, 7, 6, 12, 8, 15, 13, 18;

1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12;

1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28;

PROG

(Haskell)

import Data.List (inits)

a245093 n k = a245093_tabl !! (n-1) !! (k-1)

a245093_row n = a245093_tabl !! (n-1)

a245093_tabl = tail $ inits $ a000203_list

-- Reinhard Zumkeller, Dec 12 2015

CROSSREFS

Cf. A000203, A024916, A027293, A104765, A140207, A221529, A237270, A237593, A245099, A265652.

Sequence in context: A095709 A076152 A107638 * A104765 A308690 A329512

Adjacent sequences: A245090 A245091 A245092 * A245094 A245095 A245096

KEYWORD

nonn,tabl,look

AUTHOR

Omar E. Pol, Jul 15 2014

STATUS

approved