Number of arrays of n nonnegative integers with value i>0 appearing only after i-1 has appeared at least 4 times.

A210541

Number of arrays of n nonnegative integers with value i>0 appearing only after i-1 has appeared at least 4 times.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =8a(7) =16a(8) =33a(9) =73a(10) =177a(11) =467a(12) =1309a(13) =3813a(14) =11409a(15) =34999a(16) =110510a(17) =361194a(18) =1226930a(19) =4334048a(20) =15877297a(21) =60049447a(22) =233426007a(23) =929616461a(24) =3786970033a(25) =15777120457a(26) =67260334185a(27) =293617319221

External references