acker.vs 286 Bytes
# solution of fast growing recursive function ackerman(mc,nc)

MC : int = 3;
NC : int = 8;

acker = map (m, n) [
    ? [ m=0 -> ^ n+1;
      | n=0 -> ^ @(m-1, 1);
      |  *  -> ^ @(m-1, @(m, n-1)); ] ];

program = map () -> () [
    write_int (acker (MC, NC));
    write_char (10); ];