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.

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

Offset: 1

Author

N. J. A. Sloane, Nov 03 2018

Keywords

• nonn
• base
• fini
• full

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.