OFFSET
1,2
COMMENTS
This sequence can be seen as a variant of the knight's tour described in A316667 transposed to the space with infinite dimensions described in A309817; two positions in N^N are at knight's distance if they differ exactly by 2 units alongside some axis and by 1 unit alongside some other axis.
Unlike A316667, this sequence is infinite.
LINKS
Rémy Sigrist, PARI program for A326927
FORMULA
EXAMPLE
The first terms, alongside a(n+1)/a(n), are:
n a(n) a(n+1)/a(n)
-- ---- -----------
1 1 2^+2 * 3^+1
2 12 2^-2 * 3^+1
3 9 2^+1 * 3^-2
4 2 2^+2 * 3^+1
5 24 2^-2 * 3^+1
6 18 2^+1 * 3^-2
7 4 2^-2 * 3^+1
8 3 3^-1 * 5^+2
9 25 5^-2 * 7^+1
10 7 2^+2 * 3^+1
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Oct 22 2019
STATUS
approved