code:

int[][] cells = new int[14][19];

int hex(int x, int y) {
	if (x < 0 || x >= cells[0].length || y < 0 || y >= cells.length) {
		return 5; // default "water" hexes off the edge of the map.
	}
	return cells[y][x];
}

enum Dir { N, NE, SE, S, SW, NW };

int adj(int x, int y, Dir d) {
	switch(d) {
		case N:  return hex(x,   y-1);
		case NE: return hex(x+1, y-1+(x % 2));
		case SE: return hex(x+1, y  +(x % 2));
		case S:  return hex(x,   y+1);
		case SW: return hex(x-1, y  +(x % 2));
		default: return hex(x-1, y-1+(x % 2));
	}
}