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A245093 Triangle read by rows in which row n lists the first n terms of A000203. 6
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;

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 A064884 A093560

Adjacent sequences:  A245090 A245091 A245092 * A245094 A245095 A245096

KEYWORD

nonn,tabl,look

AUTHOR

Omar E. Pol, Jul 15 2014

STATUS

approved

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Last modified October 17 12:50 EDT 2018. Contains 316280 sequences. (Running on oeis4.)