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A108039
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Replace each entry 2^i(2j+1) of the triangle in A008280 with i and replace 0's with *'s; then the entries n in the new triangle do not occur beyond diagonal a(n), measured from the left edge and taking the left edge to be diagonal number 1.
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0
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2, 4, 4, 4, 8, 8, 8, 8, 10, 12, 12, 16, 16, 16, 16, 16, 18, 20
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..17.
V. I. Arnold, Bernoulli-Euler updown numbers associated with function singularities, their combinatorics and arithmetics, Duke Math. J. 63 (1991), 537-555.
Sanjay Ramassamy, Modular periodicity of the Euler numbers and a sequence by Arnold, arXiv:1712.08666 [math.CO], 2017.
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EXAMPLE
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3's do not occur beyond the 4th diagonal, so a(3) = 4.
Triangle begins:
*
* 0
0 0 *
* 0 1 1
0 0 2 1 *
* 0 1 1 4 4
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CROSSREFS
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Cf. A008280.
Sequence in context: A225355 A117726 A172307 * A103228 A076340 A076345
Adjacent sequences: A108036 A108037 A108038 * A108040 A108041 A108042
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Jun 01 2005
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EXTENSIONS
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Corrected and extended by Sanjay Ramassamy, Nov 03 2018
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STATUS
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approved
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