Fourth binomial transform of A010686 (period 2: repeat 1,5).
A080961
Fourth binomial transform of A010686 (period 2: repeat 1,5).
Terms
- a(0) =1a(1) =9a(2) =57a(3) =321a(4) =1713a(5) =8889a(6) =45417a(7) =230001a(8) =1158753a(9) =5820009a(10) =29178777a(11) =146130081a(12) =731358993a(13) =3658920729a(14) =18300980937a(15) =91524036561a(16) =457677578433
External references
- oeis: A080961