a(n) = A002526(n+2) + A002526(n) - A002527(n+2) - A002527(n+1) + A002527(n) - A188493(n).

A188492

a(n) = A002526(n+2) + A002526(n) - A002527(n+2) - A002527(n+1) + A002527(n) - A188493(n).

Terms

    a(0) =0a(1) =0a(2) =2a(3) =6a(4) =14a(5) =38a(6) =124a(7) =400a(8) =1232a(9) =3712a(10) =11288a(11) =34628a(12) =106352a(13) =325772a(14) =996712a(15) =3050352a(16) =9340170a(17) =28602014a(18) =87576426a(19) =268129662a(20) =820931640a(21) =2513509536a(22) =7695861408a(23) =23563048304a(24) =72144604576a(25) =220890113784a(26) =676315440208

External references