NSW numbers: a(n) = 6*a(n-1) - a(n-2); also a(n)^2 - 2*b(n)^2 = -1 with b(n) = A001653(n+1).
A002315
NSW numbers: a(n) = 6*a(n-1) - a(n-2); also a(n)^2 - 2*b(n)^2 = -1 with b(n) = A001653(n+1).
Terms
- a(0) =1a(1) =7a(2) =41a(3) =239a(4) =1393a(5) =8119a(6) =47321a(7) =275807a(8) =1607521a(9) =9369319a(10) =54608393a(11) =318281039a(12) =1855077841a(13) =10812186007a(14) =63018038201a(15) =367296043199
External references
- oeis: A002315