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A216954 Triangle read by rows: A216953/2. 2
1, 1, 1, 1, 0, 3, 1, 1, 0, 6, 1, 0, 0, 0, 15, 1, 1, 3, 0, 0, 27, 1, 0, 0, 0, 0, 0, 63, 1, 1, 0, 6, 0, 0, 0, 120, 1, 0, 3, 0, 0, 0, 0, 0, 252, 1, 1, 0, 0, 15, 0, 0, 0, 0, 495, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1023, 1, 1, 3, 6, 0, 27, 0, 0, 0, 0, 0, 2010, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4095, 1, 1, 0, 0, 0, 0, 63, 0, 0, 0, 0, 0, 0, 8127 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..105.

B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, On Curling Numbers of Integer Sequences, arXiv:1212.6102, Dec 25 2012.

B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, On Curling Numbers of Integer Sequences, Journal of Integer Sequences, Vol. 16 (2013), Article 13.4.3.

EXAMPLE

Triangle begins:

1,

1, 1,

1, 0, 3,

1, 1, 0, 6,

1, 0, 0, 0, 15,

1, 1, 3, 0, 0, 27,

1, 0, 0, 0, 0, 0, 63,

1, 1, 0, 6, 0, 0, 0, 120,

1, 0, 3, 0, 0, 0, 0, 0, 252,

1, 1, 0, 0, 15, 0, 0, 0, 0, 495,

...

CROSSREFS

Cf. A216953. Main diagonal is A000740.

Sequence in context: A288108 A287822 A162169 * A124801 A124926 A175946

Adjacent sequences:  A216951 A216952 A216953 * A216955 A216956 A216957

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Sep 25 2012

STATUS

approved

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Last modified February 23 22:58 EST 2018. Contains 299595 sequences. (Running on oeis4.)