a(0)=1, a(1)=2, a(2)=6, a(3)=18; for n >= 4, a(n) = 6*a(n-1) - 11*a(n-2) + 6*a(n-3) - a(n-4).
A094864
a(0)=1, a(1)=2, a(2)=6, a(3)=18; for n >= 4, a(n) = 6*a(n-1) - 11*a(n-2) + 6*a(n-3) - a(n-4).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =53a(5) =154a(6) =443a(7) =1264a(8) =3582a(9) =10092a(10) =28291a(11) =78962a(12) =219541a(13) =608318a(14) =1680438a(15) =4629414a(16) =12722033a(17) =34882954a(18) =95451407a(19) =260698732a(20) =710802606a(21) =1934955072a(22) =5259642751a(23) =14277467618a(24) =38707663273a(25) =104816737274a(26) =283521290598a(27) =766112145594
External references
- oeis: A094864