Number of moves needed to solve 4-peg Tower of Hanoi Puzzle with n disks.

Terms

a(0) =0a(1) =3a(2) =10a(3) =19a(4) =34a(5) =57a(6) =88a(7) =123a(8) =176a(9) =253a(10) =342a(11) =449a(12) =572a(13) =749a(14) =980a(15) =1261a(16) =1560a(17) =1903a(18) =2328a(19) =2889a(20) =3562a(21) =4377a(22) =5276a(23) =6247