Number of arrays of n nonnegative integers with value i>0 appearing only after i-1 has appeared at least 3 times.

A210540

Number of arrays of n nonnegative integers with value i>0 appearing only after i-1 has appeared at least 3 times.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =8a(7) =17a(8) =40a(9) =104a(10) =291a(11) =857a(12) =2634a(13) =8455a(14) =28424a(15) =100117a(16) =368465a(17) =1410903a(18) =5599073a(19) =22968514a(20) =97267342a(21) =424927846a(22) =1913764155a(23) =8877181958a(24) =42358589064a(25) =207639979365

External references