A156563 a(n) = (-1)^n*Sum_{k=1..n} A078649(k)*(-1)^k.

2, 2, 6, 5, 8, 8, 10, 12, 14, 14, 17, 18, 20, 20, 24, 24, 27, 26, 30, 28, 34, 31, 36, 34, 40, 38, 42, 41, 44, 45, 47, 47, 50, 49, 54, 53, 57, 55, 60, 59, 62, 62, 64, 66, 67, 68, 70, 70, 74, 74, 76, 77, 80, 80, 82, 83, 84, 87, 88, 90, 90, 94, 94, 96, 97, 100, 101

Offset

1,1

Links

Jinyuan Wang, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A078649, A156562.

Sequence in context: A115255 A055924 A286278 * A201500 A054917 A111419

Adjacent sequences: A156560 A156561 A156562 * A156564 A156565 A156566

Keyword

nonn

Author

Benoit Cloitre, Feb 10 2009

Status

approved