1,7

Table of n, a(n) for n=1..20.

Column k=4 (or k=-4) of A062866.

Equal number moved left and right, see A062868.

Sequence in context: A231486 A048291 A015089 * A069449 A100465 A140031

Adjacent sequences: A179562 A179563 A179564 * A179566 A179567 A179568

nonn

R. H. Hardin, Jul 19 2010

a(19)-a(20) from Alois P. Heinz, Jul 31 2018

approved