Number of n X 3 nonnegative integer arrays with each row and column increasing from zero by 0, 1, 2 or 3.

A202919

Number of n X 3 nonnegative integer arrays with each row and column increasing from zero by 0, 1, 2 or 3.

Terms

    a(0) =1a(1) =10a(2) =90a(3) =534a(4) =2310a(5) =8012a(6) =23661a(7) =61830a(8) =146718a(9) =321970a(10) =662233a(11) =1289652a(12) =2396745a(13) =4277352a(14) =7367630a(15) =12299364a(16) =19968183a(17) =31619610a(18) =48956236a(19) =74269690a(20) =110601480a(21) =161937204a(22) =233439075a(23) =331722170a(24) =465180300a(25) =644367906a(26) =882444915a(27) =1195692040

External references