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#JavaScript (ES6), 48 40 bytes
Takes input as (a)(n).
(a)(n)
a=>g=n=>n>0?a.map(x=>t+=g(n-x),t=0)|t:!n
Try it online!
#JavaScript (ES6), 48 48 40 bytes
Takes input as (na)(an).
(na)(an)
n=>g=(a,k=n)=>k>0a=>g=n=>n>0?a.map(x=>t+=g(a,kn-x),t=0)|t:!kn
Try it online!Try it online!
#JavaScript (ES6), 48 bytes
Takes input as (n)(a).
(n)(a)
n=>g=(a,k=n)=>k>0?a.map(x=>t+=g(a,k-x),t=0)|t:!k
