A191651 Ratio A191650(n+1)/A191650(n).

2, 2, 2, 4, 6, 9, 15, 20, 28, 42, 60, 90, 135, 195, 286, 418, 608, 896, 1316, 1927, 2829, 4140, 6060, 8888, 13024, 19092, 27993, 41013, 60102, 88086, 129082, 189196, 277298, 406385, 595595, 872872, 1279224, 1874826, 2747700, 4026950, 5901823, 8649495

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..50

Formula

Empirical: a(n)=a(n-1)+a(n-3)-a(n-4)+a(n-5)+a(n-6)-a(n-9) - R. H. Hardin, Jun 13 2011

Empirical g.f.: x*(2 + 2*x^4 + x^5 - x^7 - x^8) / ((1 - x - x^3)*(1 + x^4 - x^6)). - Colin Barker, May 04 2018

Crossrefs

Sequence in context: A306749 A338286 A272371 * A010558 A365717 A060827

Adjacent sequences: A191648 A191649 A191650 * A191652 A191653 A191654

Keyword

nonn

Author

R. H. Hardin, Jun 10 2011

Status

approved