A108039 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.

2, 4, 4, 4, 8, 8, 8, 8, 10, 12, 12, 16, 16, 16, 16, 16, 18, 20

Offset: 0

Author

N. J. A. Sloane, Jun 01 2005

Keywords

• nonn
• more

Examples

			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
		

Links

• 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.

Crossrefs

Cf. A008280.

Extensions

Corrected and extended by Sanjay Ramassamy, Nov 03 2018