G.f. ( Chi(sqrt(x))^4 + Chi(-sqrt(x))^4 )/2, where Chi(x) = Product_{k >= 0} 1 + x^(2*k+1) is the g.f. of A000700.
A366104
G.f. ( Chi(sqrt(x))^4 + Chi(-sqrt(x))^4 )/2, where Chi(x) = Product_{k >= 0} 1 + x^(2*k+1) is the g.f. of A000700.
Terms
- a(0) =1a(1) =6a(2) =17a(3) =38a(4) =84a(5) =172a(6) =325a(7) =594a(8) =1049a(9) =1796a(10) =3005a(11) =4912a(12) =7877a(13) =12430a(14) =19309a(15) =29580a(16) =44766a(17) =66978a(18) =99150a(19) =145374a(20) =211242a(21) =304382a(22) =435194a(23) =617674a(24) =870651a(25) =1219352a(26) =1697283a(27) =2348888a(28) =3232919a(29) =4426546
External references
- oeis: A366104