Increments used in Sedgewick-Incerpi upper bound for shell sort.

Terms

a(0) =1a(1) =3a(2) =7a(3) =21a(4) =48a(5) =112a(6) =336a(7) =861a(8) =1968a(9) =4592a(10) =13776a(11) =33936a(12) =86961a(13) =198768a(14) =463792a(15) =1391376a(16) =3402672a(17) =8382192a(18) =21479367a(19) =49095696a(20) =114556624a(21) =343669872a(22) =852913488a(23) =2085837936a(24) =5138283696a(25) =13166851971a(26) =30095661648a(27) =70223210512