a(n) = binomial(3*n+3,n) + binomial(3*n+2,n-1) for n >= 0.
A355347
a(n) = binomial(3*n+3,n) + binomial(3*n+2,n-1) for n >= 0.
Terms
- a(0) =1a(1) =7a(2) =44a(3) =275a(4) =1729a(5) =10948a(6) =69768a(7) =447051a(8) =2877875a(9) =18599295a(10) =120609840a(11) =784384692a(12) =5114119724a(13) =33417386200a(14) =218786861392
External references
- oeis: A355347