A098426 a(n)=(1/2)*sum(i=0,n,rad(binomial(n,i))) where rad(k)=A007947(k).

1, 2, 4, 6, 16, 27, 64, 66, 94, 287, 1024, 645, 2380, 6723, 12094, 7136, 36772, 38733, 161254, 241083, 571714, 1203173, 4194304, 2005009, 2162496, 8739877, 6699838, 27330423, 112844656, 41322885, 252807388, 201501336, 419398108, 2840231975

Offset: 1

Author

Benoit Cloitre, Oct 26 2004

Keywords

• nonn

Comments

For n>1 a(n) odd seems to imply 2*phi(n)

Crossrefs

Halved row sums of A080396.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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