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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.
3
1, 2, 6, 24, 120, 720, 54, 432, 3, 30, 0
OFFSET
1,2
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)
EXAMPLE
a(6)=720, so for a(7) we compute 7*720 = 5040 which becomes 54 = a(7).
CROSSREFS
KEYWORD
nonn,base,fini,full
AUTHOR
N. J. A. Sloane, Nov 03 2018
STATUS
approved