A177985 A177983(n) - A177961(n).

1, 1, -2, 4, 1, -5, 7, 1, -8, 10, -9, -1, 13, 1, -14, 1, 16, -17, 19, 1, -20, 22, -20, -2, 25, -24, -1, 28, 1, -29, 1, 31, -32, 34, 1, -35, 2, 36, -38, 40, -39, -1, 43, -41, -2, 1, 46, -47, 49, 1, -50, 52, 1, -53, 55, -54, -1, 2, 2, -4, 1, 61, -62, 64, -62, -2, 67, 1, -68, 4, -3, -1, 73, 1, -74, 1, 76, -77, 2, 78

Offset

1,3

Links

Table of n, a(n) for n=1..80.

Formula

a(3k+1)+a(3k+2)+a(3k+3)=0, k>=0.

Crossrefs

Cf. A177983, A177961.

Sequence in context: A070937 A278437 A175036 * A198512 A059573 A308437

Adjacent sequences: A177982 A177983 A177984 * A177986 A177987 A177988

Keyword

sign,easy

Author

Vladimir Shevelev, May 16 2010

Status

approved