G.f.: exp( Sum_{n>=1} 4^A001511(n) * x^n/n ), where 2^A001511(n) is the highest power of 2 that divides 2*n.
A217553
G.f.: exp( Sum_{n>=1} 4^A001511(n) * x^n/n ), where 2^A001511(n) is the highest power of 2 that divides 2*n.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =44a(4) =128a(5) =308a(6) =752a(7) =1628a(8) =3584a(9) =7268a(10) =14864a(11) =28556a(12) =55296a(13) =102036a(14) =189168a(15) =337084a(16) =603136a(17) =1044676a(18) =1814288a(19) =3064556a(20) =5188352a(21) =8578548a(22) =14205936a(23) =23041308a(24) =37420800a(25) =59680548a(26) =95265552a(27) =149620812a(28) =235161216a(29) =364301652
External references
- oeis: A217553