The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A142971 Triangle read by rows: A061397 with negative signs interleaved with (k-1) zeros. 2
 0, -2, 0, -3, 0, 0, 0, -2, 0, 0, -5, 0, 0, 0, 0, 0, -3, -2, 0, 0, 0, -7, 0, 0, 0, 0, 0, 0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, 0, -5, 0, 0, -2, 0, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -3, 0, -2, 0, 0, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -7, 0, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, -5, 0, -3, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Except for the first term, row products are given by A062953. LINKS EXAMPLE Table begins: 0; -2, 0; -3, 0, 0; 0,-2, 0, 0; -5, 0, 0, 0, 0; 0,-3,-2, 0, 0, 0; -7, 0, 0, 0, 0, 0, 0; 0, 0, 0,-2, 0, 0, 0, 0; 0, 0,-3, 0, 0, 0, 0, 0, 0; PROG (Excel) =if(mod(row(); column())=0; lookup(row()/column(); A000027; -A061397); "") CROSSREFS Cf. A061397, A062953, A008472. Sequence in context: A079302 A138806 A181105 * A104117 A114511 A085199 Adjacent sequences:  A142968 A142969 A142970 * A142972 A142973 A142974 KEYWORD sign,tabl AUTHOR Mats O. Granvik and Gary W. Adamson, Jul 14 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 14 05:51 EDT 2021. Contains 345018 sequences. (Running on oeis4.)