A049749 a(n) = Sum_{i=0..2n} (-1)^i * T(i,2n-i), array T as in A049747.

0, 3, 9, 19, 33, 53, 59, 101, 109, 141, 211, 235, 275, 315, 353, 435, 511, 543, 609, 663, 749, 857, 919, 1025, 1081, 1211, 1281, 1379, 1471, 1579, 1705, 1827, 1971, 2035, 2171, 2329, 2429, 2649, 2735, 2937, 3069, 3109, 3301, 3471, 3699, 3917, 4011, 4163, 4287

Offset

0,2

Links

Table of n, a(n) for n=0..48.

Crossrefs

Sequence in context: A066506 A058331 A328950 * A147055 A146638 A147135

Adjacent sequences: A049746 A049747 A049748 * A049750 A049751 A049752

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Aug 06 2021

Status

approved