Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 1.
A257608
Triangle read by rows: T(n,k) = t(n-k, k); t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), where f(x) = 9*x + 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =20a(5) =1a(6) =1a(7) =219a(8) =219a(9) =1a(10) =1a(11) =2218a(12) =8322a(13) =2218a(14) =1a(15) =1a(16) =22217a(17) =220222a(18) =220222a(19) =22217a(20) =1a(21) =1a(22) =222216a(23) =5006247a(24) =12332432a(25) =5006247a(26) =222216a(27) =1a(28) =1a(29) =2222215
External references
- oeis: A257608