login
A134429
a(n) = (-1)^(1 + n) * 2 * ( -1/2 -n + (-1)^((1 + n)*(2 + n)/2)).
2
3, -5, 3, -5, 11, -13, 11, -13, 19, -21, 19, -21, 27, -29, 27, -29, 35, -37, 35, -37, 43, -45, 43, -45, 51, -53, 51, -53, 59, -61, 59, -61, 67, -69, 67, -69, 75, -77, 75, -77, 83, -85, 83, -85, 91, -93, 91, -93, 99, -101, 99, -101, 107, -109, 107, -109, 115, -117, 115, -117, 123, -125, 123, -125, 131, -133, 131
OFFSET
0,1
COMMENTS
Previous name was: Array read by rows: row n lists 4 terms: k, m, k, m where k = 8n+3 and m = -8n -5.
FORMULA
a(2*n) + a(2*n+1) = -2.
a(n) = (-1)^(1 + n) * 2 * ( -1/2 -n + (-1)^((1 + n)*(2 + n)/2)). - Gerry Martens, Nov 08 2022
MATHEMATICA
Table[With[{k=8n+3, m=-8n-5}, {k, m, k, m}], {n, 0, 30}]//Flatten (* Harvey P. Dale, Jul 18 2018 *)
CROSSREFS
Cf. A134314 (first differences).
Sequence in context: A296489 A253398 A151568 * A100667 A329736 A324086
KEYWORD
sign,easy,less
AUTHOR
Paul Curtz, Jan 31 2008
EXTENSIONS
Edited by Omar E. Pol, Mar 23 2008
Edited by B. D. Swan (bdswan(AT)gmail.com), Dec 20 2008
New name (using formula from Gerry Martens) from Joerg Arndt, Nov 08 2022
STATUS
approved