Central Delannoy numbers: a(n) = Sum_{k=0..n} C(n,k)*C(n+k,k).
A001850
Central Delannoy numbers: a(n) = Sum_{k=0..n} C(n,k)*C(n+k,k).
Terms
- a(0) =1a(1) =3a(2) =13a(3) =63a(4) =321a(5) =1683a(6) =8989a(7) =48639a(8) =265729a(9) =1462563a(10) =8097453a(11) =45046719a(12) =251595969a(13) =1409933619a(14) =7923848253a(15) =44642381823a(16) =252055236609
External references
- oeis: A001850