A030386 Triangle T(n,k): write n in base 4, reverse order of digits.

0, 1, 2, 3, 0, 1, 1, 1, 2, 1, 3, 1, 0, 2, 1, 2, 2, 2, 3, 2, 0, 3, 1, 3, 2, 3, 3, 3, 0, 0, 1, 1, 0, 1, 2, 0, 1, 3, 0, 1, 0, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 0, 2, 1, 1, 2, 1, 2, 2, 1, 3, 2, 1, 0, 3, 1, 1, 3, 1, 2, 3, 1, 3, 3, 1, 0, 0, 2, 1, 0, 2, 2, 0, 2, 3, 0, 2, 0, 1, 2

Offset

0,3

Links

Reinhard Zumkeller, Rows n = 0..1000 of triangle, flattened

Example

Triangle begins:
0
1
2
3
0, 1
1, 1
2, 1
3, 1
0, 2
1, 2
2, 2
3, 2
0, 3
1, 3
2, 3
3, 3
0, 0, 1
1, 0, 1 ... - Philippe Deléham, Oct 20 2011

Maple

A030386_row := n -> op(convert(n, base, 4)):
seq(A030386_row(n), n=0..36); # Peter Luschny, Nov 28 2017

Mathematica

Flatten[Table[Reverse[IntegerDigits[n, 4]], {n, 0, 50}]] (* Harvey P. Dale, Oct 13 2012 *)

Prog

(PARI) A030386(n, k=-1)=/*k<0&&error("Flattened sequence not yet implemented.")*/n\4^k%4 \\ Assuming that columns are numbered starting with k=0 as in A030308, A030341, ... \\ M. F. Hasler, Jul 21 2013
(Haskell)
a030386 n k = a030386_tabf !! n !! k
a030386_row n = a030386_tabf !! n
a030386_tabf = iterate succ [0] where
   succ []     = [1]
   succ (3:ts) = 0 : succ ts
   succ (t:ts) = (t + 1) : ts
-- Reinhard Zumkeller, Sep 18 2015

Crossrefs

Cf. A030308, A030341, A031235, A030567, A031007, A031045, A031087, A031298 for the base-2 to base-10 analogs.

Cf. A007090.

Sequence in context: A038570 A306559 A103498 * A096799 A370292 A243081

Adjacent sequences: A030383 A030384 A030385 * A030387 A030388 A030389

Keyword

nonn,base,tabf,less

Author

Clark Kimberling

Extensions

Initial 0 and better name by Philippe Deléham, Oct 20 2011

Status

approved