The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A284319 Expansion of Product_{k>=0} (1 - x^(5*k+2)) in powers of x. 2
 1, 0, -1, 0, 0, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 2, 0, -1, -1, 0, 2, 0, -1, -1, 0, 3, 0, -2, -1, 0, 3, 0, -3, -1, 1, 4, 0, -4, -1, 1, 4, 0, -5, -1, 2, 5, 0, -7, -1, 3, 5, 0, -8, -1, 5, 6, -1, -10, -1, 6, 6, -1, -12, -1, 9, 7, -2, -14, -1, 11, 7, -3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,20 LINKS FORMULA a(n) = -(1/n)*Sum_{k=1..n} A284280(k)*a(n-k), a(0) = 1. MATHEMATICA CoefficientList[Series[Product[1 - x^(5k + 2), {k, 0, 100}], {x, 0, 100}], x] (* Indranil Ghosh, Mar 25 2017 *) PROG (PARI) Vec(prod(k=0, 100, 1 - x^(5*k + 2)) + O(x^101)) \\ Indranil Ghosh, Mar 25 2017 CROSSREFS Cf. Product_{k>=0} (1 - x^(5*k+m)): A284314 (m=1), this sequence (m=2), A284320 (m=3), A284317 (m=4). Cf. A281272, A284280. Sequence in context: A112761 A284320 A281271 * A281272 A147310 A025886 Adjacent sequences:  A284316 A284317 A284318 * A284320 A284321 A284322 KEYWORD sign AUTHOR Seiichi Manyama, Mar 25 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 January 22 00:08 EST 2022. Contains 350481 sequences. (Running on oeis4.)