OFFSET
0,20
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..533
MATHEMATICA
a[k_, n_]:=a[k, n]=If[n>2k+2, (a[k, (n-1)]*a[k, (n-2k-2)]+a[k, (n-k-1)]*a[k, (n-k-2)])/a[k, (n-2k-3)], 1];
Map[a[8, #]&, Range[0, 50]] (* Peter J. C. Moses, Apr 17 2016 *)
PROG
(PARI) {a(n) = if(n<= 19, 1, (a(n-1)*a(n-18) + a(n-9)*a(n-10))/a(n-19))}; for(n=1, 50, print1(a(n), ", ")) \\ G. C. Greubel, Jul 30 2018
(Magma) [n le 19 select 1 else (Self(n-1)*Self(n-18)+Self(n-9)*Self(n-10))/Self(n-19): n in [1..60]]; // G. C. Greubel, Jul 30 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev and Peter J. C. Moses, Apr 17 2016
STATUS
approved