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!)
 A286656 Square array A(n,k), n>=0, k>=1, read by antidiagonals, where column k is the expansion of Product_{j>=1} (1 - x^j)/(1 - x^(k*j)). 1
 1, 1, 0, 1, -1, 0, 1, -1, 0, 0, 1, -1, -1, -1, 0, 1, -1, -1, 1, 1, 0, 1, -1, -1, 0, -1, -1, 0, 1, -1, -1, 0, 1, 0, 1, 0, 1, -1, -1, 0, 0, 0, 2, -1, 0, 1, -1, -1, 0, 0, 2, -1, -1, 2, 0, 1, -1, -1, 0, 0, 1, -1, 1, -1, -2, 0, 1, -1, -1, 0, 0, 1, 1, 0, 2, 3, 2, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,43 LINKS FORMULA G.f. of column k: Product_{j>=1} (1 - x^j)/(1 - x^(k*j)). EXAMPLE Square array begins:    1,  1,  1,  1,  1, ...    0, -1, -1, -1, -1, ...    0,  0, -1, -1, -1, ...    0, -1,  1,  0,  0, ...    0,  1, -1,  1,  0, ... CROSSREFS Columns k=1-5 give: A000007, A081362, A137569, A082303, A145466. Main diagonal gives A010815. Cf. A286653. Sequence in context: A321763 A280126 A178536 * A048484 A298601 A016366 Adjacent sequences:  A286653 A286654 A286655 * A286657 A286658 A286659 KEYWORD sign,tabl AUTHOR Seiichi Manyama, May 14 2017 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 September 18 02:54 EDT 2021. Contains 347504 sequences. (Running on oeis4.)