A127770 a(n) = A127768(2n+1). A bisection of the row sums of the inverse of number triangle A(n,k) = 1/C(n) if k <= n <= 2k, 0 otherwise, where C(n) = A000108(n).

1, 4, 29, 301, 3441, 42019, 534978, 7020706, 94288121, 1289627931, 17902158534, 251577092029, 3572042403354, 51166198378830, 738494266832548, 10729649544155311, 156802065560857737

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Crossrefs

Cf. A000108, A127768, A127769.

Sequence in context: A217807 A348651 A360584 * A121630 A089470 A360834

Adjacent sequences: A127767 A127768 A127769 * A127771 A127772 A127773

Keyword

nonn

Author

Paul Barry, Jan 28 2007

Status

approved