a(n) = n! * Sum_{k=0..floor(n/3)} (k+1)^(k-1) / (6^k * k! * (n-3*k)!).
A362525
a(n) = n! * Sum_{k=0..floor(n/3)} (k+1)^(k-1) / (6^k * k! * (n-3*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =11a(6) =51a(7) =246a(8) =897a(9) =7085a(10) =51221a(11) =260426a(12) =2938541a(13) =28279967a(14) =184234415a(15) =2714662406a(16) =32614422401a(17) =259026339161
External references
- oeis: A362525