a(n) = A305312(n)/4 if A305312(n)is even and a(n) = (A305312(n) - 1)/4 if A305312(n) is odd, for n >= 1.

A308687

a(n) = A305312(n)/4 if A305312(n)is even and a(n) = (A305312(n) - 1)/4 if A305312(n) is odd, for n >= 1.

Terms

    a(0) =1a(1) =8a(2) =55a(3) =379a(4) =1891a(5) =2600a(6) =17821a(7) =64261a(8) =84680a(9) =122149a(10) =421849a(11) =837224a(12) =2183005a(13) =3950155a(14) =5738419a(15) =18883369a(16) =39331711a(17) =74157931a(18) =94070600a(19) =128629621a(20) =185381839a(21) =269583560a(22) =486268651a(23) =1847753209a(24) =2519186671a(25) =3192137000a(26) =4210906771a(27) =6000283981a(28) =8707689224a(29) =12664688905

External references