The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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. 0
 2, 4, 4, 4, 8, 8, 8, 8, 10, 12, 12, 16, 16, 16, 16, 16, 18, 20 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 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. EXAMPLE 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 CROSSREFS Cf. A008280. Sequence in context: A225355 A117726 A172307 * A103228 A076340 A076345 Adjacent sequences: A108036 A108037 A108038 * A108040 A108041 A108042 KEYWORD nonn,more AUTHOR N. J. A. Sloane, Jun 01 2005 EXTENSIONS Corrected and extended by Sanjay Ramassamy, Nov 03 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 6 23:12 EST 2023. Contains 360111 sequences. (Running on oeis4.)