[seqfan] A055099

[vincenzo.librandi at tin.it]

 Dear Seqfans
Sequence A055099.
Is correct the formula:
a(n)=3*a(n-1)+2*a(n-2)   with a(0)=1, a(1)=4 ? 
a(2)=3*4*2*1=14;a(3)=3*14+2*4=50;a(4)=3*50+2*14=178;a(5)=3*178+2*50=634;a(6)=3*634+2*178=2258;a(7)=3*2258+2*634=8042;a(8)=3*8042+2*2258=28642;a(9)=3*28642+2*8042=102010; a(10)=3*102010+2*28642=363314
etc.
Dove cade ?
Thanks, regards Vincenzo Librandi