A125434 Number of base 22 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 22, 274, 2878, 34882, 431782, 5461618, 69940774, 903223618, 11728549510, 152847561714, 1996603379606, 26120802913570, 342065474231334, 4482377137554002, 58760550692131318, 770509932031611266

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n

Links

Table of n, a(n) for n=0..16.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))

Crossrefs

Sequence in context: A128766 A278153 A223116 * A023020 A022650 A172226

Adjacent sequences: A125431 A125432 A125433 * A125435 A125436 A125437

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved