a(n) = Sum_{k=1..n} k*A001168(k)*binomial(n-1,k-1), where A001168(k) is the number of fixed polyominoes with k cells.
A343208
a(n) = Sum_{k=1..n} k*A001168(k)*binomial(n-1,k-1), where A001168(k) is the number of fixed polyominoes with k cells.
Terms
- a(0) =1a(1) =5a(2) =27a(3) =143a(4) =744a(5) =3832a(6) =19636a(7) =100348a(8) =511969a(9) =2608905a(10) =13282011a(11) =67567527a(12) =343510966a(13) =1745495390a(14) =8865633276a(15) =45013599940a(16) =228478238613
External references
- oeis: A343208