A047021 a(n) = Sum_{i=0..n} T(i,n-i) where T is given by A047020.

1, 2, 3, 5, 9, 18, 28, 53, 101, 195, 390, 704, 1371, 2676, 5253, 10506, 19840, 39056, 76968, 152168, 304336, 586864, 1161577, 2300544, 4565558, 9131116, 17813324, 35369544, 70256203, 139745471, 279490942, 549138068, 1092533184

Offset

0,2

Links

Table of n, a(n) for n=0..32.

Crossrefs

Sequence in context: A064769 A320641 A365640 * A201359 A369392 A047031

Adjacent sequences: A047018 A047019 A047020 * A047022 A047023 A047024

Keyword

nonn

Author

Clark Kimberling

Extensions

a(26) corrected by Sean A. Irvine, May 10 2021

Status

approved