cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A321008 a(1)=1; thereafter a(n) is obtained by applying Eric Angelini's remove-repeated-digits map, x->A320486(x), to n*a(n-1), stopping when 0 is reached.

Original entry on oeis.org

1, 2, 6, 24, 120, 720, 54, 432, 3, 30, 0
Offset: 1

Views

Author

N. J. A. Sloane, Nov 03 2018

Keywords

Examples

			a(6)=720, so for a(7) we compute 7*720 = 5040 which becomes 54 = a(7).

References

  • Eric Angelini, Posting to Sequence Fans Mailing List, Oct 24 2018

Links

  • N. J. A. Sloane, Coordination Sequences, Planing Numbers, and Other Recent Sequences (II), Experimental Mathematics Seminar, Rutgers University, Jan 31 2019, Part I, Part 2, Slides. (Mentions this sequence)

Crossrefs

Cf. A320485, A320486, A321009.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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