a(n) = T(6,n), array T given by A048505.

Terms

a(0) =1a(1) =50a(2) =163a(3) =421a(4) =1005a(5) =2317a(6) =5245a(7) =11741a(8) =26077a(9) =57565a(10) =126429a(11) =276445a(12) =602077a(13) =1306589a(14) =2826205a(15) =6094813a(16) =13107165a(17) =28114909a(18) =60162013a(19) =128450525a(20) =273678301a(21) =581959645a(22) =1235222493a(23) =2617245661a(24) =5536481245a(25) =11693719517a(26) =24662507485a(27) =51942260701a(28) =109253230557