a(n) = sum of terms in n-th row of A078448.

Terms

a(0) =1a(1) =5a(2) =16a(3) =41a(4) =88a(5) =187a(6) =360a(7) =563a(8) =888a(9) =1303a(10) =1810a(11) =2407a(12) =3290a(13) =4263a(14) =5376a(15) =6761a(16) =8470a(17) =10345a(18) =12290a(19) =14661a(20) =17212a(21) =19927a(22) =23272a(23) =26785a(24) =31052a(25) =35169a(26) =40162a(27) =45301a(28) =51148a(29) =57745