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A163343 Central diagonal of A163334 and A163336. 3
0, 4, 8, 44, 40, 36, 72, 76, 80, 404, 400, 396, 360, 364, 368, 332, 328, 324, 648, 652, 656, 692, 688, 684, 720, 724, 728, 3644, 3640, 3636, 3600, 3604, 3608, 3572, 3568, 3564, 3240, 3244, 3248, 3284, 3280, 3276, 3312, 3316, 3320, 2996, 2992, 2988 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

It is easy to see by induction that these terms are always divisible by 4.

LINKS

Table of n, a(n) for n=0..47.

FORMULA

a(n) = 4*A163344(n).

a(n) = A163332(A338086(n)) = A338086(A128173(n)). - Kevin Ryde, Nov 06 2020

PROG

(PARI) a(n) = my(v=digits(n, 3), s=Mod(0, 2)); for(i=1, #v, if(s, v[i]=2-v[i]); s+=v[i]); fromdigits(v, 9)<<2; \\ Kevin Ryde, Nov 06 2020

CROSSREFS

Cf. A163344 (quarter), A128173, A163332, A163334, A338086.

Peano curve axes: A163480, A163481.

Sequence in context: A111411 A137054 A338423 * A284972 A045639 A337782

Adjacent sequences:  A163340 A163341 A163342 * A163344 A163345 A163346

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jul 29 2009

STATUS

approved

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Last modified August 6 00:36 EDT 2021. Contains 346493 sequences. (Running on oeis4.)