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Search: id:A126477
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| A126477 |
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Number of base 9 n-digit numbers with adjacent digits differing by three or less. |
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+0
3
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| 1, 9, 51, 301, 1787, 10619, 63111, 375091, 2229307, 13249619, 78747531, 468026571, 2781660187, 16532466059, 98258743211, 583989138891, 3470869901227, 20628701920939, 122604233247851, 728683659684651
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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[Empirical] a(base,n)=a(base-1,n)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
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CROSSREFS
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Cf. Base 9 differing by two or less A126396, one or less A126363.
Sequence in context: A125319 A080621 A027218 this_sequence A120665 A094793 A036425
Adjacent sequences: A126474 A126475 A126476 this_sequence A126478 A126479 A126480
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 27 2006
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